490 Kyle, Jessica Jones

492 Vassant, F&WS

499 Arlene, Daredevil TV

501 L. Atwood, F&WS

505 Mohawk, Logan

508 Kelly, FF 2000s

512 Najaf, Ms. Marvel

516 no clue listed

518 Greg Pressfield, Cloak and Dagger

527 Ador, Agents of SHIELD

537 Mrs Manfredi, Venom

Those are correct. List updated. I'll add missing clues for 516 shortly (though I'll save the character specific clue for when I do the last batch of those).

Remaining character specific clues added.

414. Original TV show character, though shares code name with unrelated Marvel character; 10s; unrelated character from X-Men; mercenary
415. Original TV show character; 10s; medical doctor
416. From a TV show; based on comics; 10s; Runaways; was intended to be sacrificed
419. Original TV show character; 10s; attended sister's graduation
421. From a TV show; based on comics; 10s; Strange Tales; appeared in vision of someone's fears
424. Original TV show character; 10s; some sort of government agent
431. From a TV show; based on real person; 20s; TV writer
434. Original TV show character; 20s; sidekick
443. Original TV show character; 10s; security guard
444. Original TV show character; 20s; was robbed of his memories
446. Original movie character; 10s; assisted in several crimes
448. Original TV show character; 10s; nurse
449. From a TV show; based on comics; 10s; Fantastic Four Annual; doctor and researcher
461. Original TV show character; 10s; crime family enforcer
462. From a TV show; based on comics; 10s; New Mutants; street person
464. Original TV show character; 10s; tried to stop father from beating mother
465. Original TV show character; 10s; Air Force officer
468. Original TV show character; 70s; former child star
470. Original TV show character; 20s; investigated people's disappearance
477. Original movie character; 20s; flirted with a man he thought was a woman
485. Original movie deleted scene character; 00s; attacked by main villain
488. Original TV show deleted scene character; 10s; criminal scientist
489. Original TV show character; 10s; recruited to help rebuild a club
494. Original TV show character; 10s; Defense Secretary
495. Original TV show character; 10s; part of a  dance club
503. Original TV show character; 10s; agent who encuntered robots
510. Original movie character; 10s; assisted husband in recreating a gateway
516. Original TV show character; 10s; medical doctor
519. Original TV show character; 10s; criminal
523. Original TV show character; 10s; attempted to arrest major character
526. Original TV show character; 10s; security agent
529. Original TV show character; 10s; hired someone to search for brother
530. Original TV show character; 10s; spent a night on beach
534. Original TV show character; 10s; police officer (not US)
538. Original TV show character; 10s; single mother
540. Original movie character; 00s; congressman
544. Original TV show character; 10s; navy officer
548. From a commercial; based on comics; 10s; Amazing Spider-Man; arrived via rope
549. Original TV show character; 10s; arrested during class he was in
551. Original TV show character; 20s; world leader (not US)
553. From a movie; arguably based on comics; 10s; Avengers; mother of mutant
554. From a TV show; based on comics; 10s; Daredevil; former senator
555. Original movie character but surname at least named after real person; 10s; attending physician
556. Original TV show character; 10s; bar patron
557. Original TV show character; 10s; security guard
558. Original TV show character; 10s; corporation scout
559. Original TV show character; 10s; attended beach bonfire
560. Original movie character; 10s; military general
561. Original movie character; 10s; formerly in army
562. Original TV show character; 10s; computer hacker
563. Original TV show character; 10s; saved friend from suicide attempt
564. From a movie; based on comics; 10s; Amazing Spider-Man; personal assistant
568. Original TV show character; 10s; human trafficker
570. Original TV show character; 10s; hotel resident
572. Original TV show character; 10s; police officer
573. From a TV show; based on comics; 10s; Ms. Marvel; invited to small gathering
575. Original TV show character; 10s; tried to apprehend major character
576. From a movie; likely based on comics, though this version's first name unknown; 10s; X-Factor; senator
577. Original TV show character; 10s; personal assistant
579. Original TV show character; 70s; part of attempt to build a bomb
580. Original TV show character; 10s; part of ninja clan
584. Original movie character; 10s; teenager who was stalked
586. Original TV show character; 10s; mob leader
588. Original movie character; 10s; sleep induction power
589. Original TV show character; 10s; representative within extraterrestrial alliance
591. Original TV show character; 10s; representative of Asian nation
594. Original movie character; 10s; agent stationed at invesitgation site
595. Original TV show character; 20s; lived on a moon
596. Original movie character; 10s; high school student
597. Original TV show character; 10s; police officer
598. From a TV show; based on comics; 10s; Incredible Hulk; hypnotherapist
599. Original TV show character; 10s; police officer
600. Original TV show character; 10s; had an affair with a plumber
602. Original movie character; 10s; senior executive
605. Original TV show character; 10s; annoyed boss by repeatedly calling him sir
607. Original movie character; 00s; wife of a major villain
608. Original TV show character; 10s; street thug
609. From a commercial; based on mythology; 10s; Norse mythology; seen by heroes in the distance
610. Original movie character; 10s; apparent prostitute
611. Original TV show character; 10s; corrupt police officer
612. Original TV show character; 10s; police officer providing security
613. Original TV show character; 10s; faternity member
614. Original TV show character; 10s; interrogated by police over husband's crimes
615. Original TV show character; 10s; police officer guarding part of a hospital
616. Original movie character; 00s; national leader
617. Original movie character; 10s; martial artist
619. Original TV show character; 20s; had twins in 1989
620. Original TV show character; 20s; had superhuman physiology
621. Original movie character; 00s; tried to force major character to build new weapons for his group
622. Original TV show character; 10s; noticed an abundance of heroin packets in a parked car
623. From a movie; based on comics; 10s; Avengers Annual; briefly seen holding someone's hand
624. Original movie character; 20s; witnessed someone's arrival on Earth
625. Original movie character; 10s; co-worker/friend of major character
626. Original TV show character; 10s; board member
627. Original TV show character; 10s; telepath
628. Original movie character; 10s; present during invasion
630. Original TV show character; 10s; could generate and manipulate energy
631. Original TV show character; 10s; snorted heroin at party
632. Original TV show character; 10s;her earrings got stolen
633. Original TV show character; 20s; mosque attendant
634. Original TV show character; 10s; senior policeman
635. Original TV show character; 10s; discovered husband was having an affair
636. From a TV show; based on comics; 10s; Patsy Walker; hired to build a building
637. Original TV show character; 10s; tasked to guard senator
639. Original movie character; 10s; assigned to monitor major character
640. Original TV show character; 70s; reporter
642. Original TV show character; 10s; member of some sort of Armed Forces
643. Original movie character; 00s; worked in some capacity for news organization
644. Original TV show character; 10s; bartender
645. Original TV show character; 20s; harrassed major character
647. Original TV show character; 10s; medical doctor at hospital
649. Original movie character; 10s; federal agent
650. Original TV show character; 10s; friend of major villain
651. Original movie character; 10s; interested in archery
654. Original TV show character; 10s; high-ranking police officer
656. Original TV show character; 10s; ran small business with two others
657. Original TV show character; 70s; steel mill worker
658. From a TV show; based on real person; 10s; musical performer
660. Original movie character; 00s; member of Board of Directors
661. From a TV show; based on comics; 10s; Fantastic Four; can teleport others
662. Original TV show character; 10s; correction officer
663. Original TV show character; 10s; played guitar
664. Original TV show character; 10s; high-ranking army officer
665. From a commercial; based on comics; 00s; Amazing Spider-Man
667. Original TV show character; 20s; uses some sort of aerial device
668. Original TV show character; 10s; police officer
669. Original TV show character; 10s; assigned to supervise protection for someone
670. Original movie character; 10s; scientist using human subjects
671. Original movie character; 00s; school teacher
672. Original movie character; 00s; has tattoos
673. Original movie character; 00s; general/part of secret government program
674. From a TV show; based on comics; 20s; Captain America; worked on family's boat
675. Original TV show character; 10s; drug trafficker
676. Original TV show character; 10s; Air Force officer
677. Original TV show character; 10s; imitated a punishment he was witnessing
680. Original movie character; 10s; psychiatrist
681. Original TV show character; 10s; police officer ensuring security at parade
682. From a TV show; based on earlier character same continuity; 10s; held party to celebrate her son's new job
683. Original TV show character; 20s; has enhanced physiology
684. Original TV show character; 10s; homeless man
685. Original TV show character; 10s; board member
686. Original TV show character; 10s; police captain
687. Original TV show character; 70s; wanted a yellow pony
688. From a movie; based on comics but with different real name; 00s; Daredevil; crime boss
689. From a TV show; based on comics (slightly sifferent first name); 10s; Tales of Suspense; assassin
690. Original TV show character; 10s; ballet instructor.
691. From a movie; based on comics; 10s; X-Men; can fire energy blasts
692. Original movie character; 10s; high-ranking army officer
693. Original TV show character; 10s; hospital physician
695. From a movie; based on comics (comics version has different first name); 00s; Marvel Preview; son of major character
696. Original TV show character; 10s; took part in a clash with a robot
699. Original TV show character; 10s; worked in the legal department of a construction company
701. Original TV show character; 10s; criminal engineer
702. Original movie character; 00s; detected a foreign signal
703. From a movie; based on comics; 20s; Marvel Graphic Novel: [name of story]; independent contractor and friend of major character
704. Original TV show character; 10s; someone told him about a vision about his son
705. Original TV show character; 10s; pastor
706. Original TV show character; 10s; hospital nurse
707. Original TV show character; 10s; probably hasn't been to Earth
709. Original movie character; 00s; army officer
710. Original TV show character; 10s; restaurant owner
711. Original TV show character; 20s;  tried to learn three languages
712. Original movie character; 10s; manager of weapons facility
714. Original TV show character; 10s; helped maintain the security of a facility
715. From a TV show; likely based on comics character with slightly different name; 20s; Invaders; archaeologist
717. Original TV show character; 70s; active 30,000 years earlier
718. From a commercial; based on comics; 00s; Fantastic Four; claims to have powers but does not demonstrate them
719. Original TV show character; 10s; Air Force security guard
720. Original movie character; 00s; Air Force colonel
721. Original TV show character; 10s; nightclub owner
722. Original TV show character; 10s; cop who with partner  encountered a man they suspected was intoxicated
723. Original TV show character; 10s; part of criminal cleanup crew
724. Original TV show character; 10s; high school basketball player
725. From a movie; based on comics (implied); 00s; X-Men; held captive
727. Original movie character; 10s; released videos on YouTube
728. Original TV show character; 10s; criminal scientist
729. Original TV show character; 80s; scientist who aided main character
730. Original TV show character; 10s; scientist at Air Force facility
731. Original TV show character; 10s; community centre worker
732. Original TV show character; 10s; person of interest to espionage agency
734. Original TV show character; 10s; part of sex trafficking ring
735. Original TV show character; 10s; former assistant to lawyer
736. From a movie; based on comics; 10s; Captain America; technician
737. Original TV show character; 10s; prison warden
740. Original TV show character; 10s; medical staff member
742. From a commercial; based on comics; 00s; Incredible Hulk; scared a family
743. Original movie character; 10s; patient
745. Original TV show character; 10s; childhood friend of major villain
746. Original TV show character; 10s; mob boss
748. Original TV show character; 10s; investigated attack on superior officer
749. From a commercial; based on comics but gender swapped; 10s; Incredible Hulk; initially tired
750. Original movie character; 10s; ex-fiancée of major character
751. Original TV show character; 10s; reformed criminal gang leader
752. Original TV show character; 10s; Air Force officer
753. Original TV show character; 10s; prison inmate
755. Original TV show character; 10s;  accountant
756. Original TV show character; 10s; mental health centre patient
757. Original TV show character; 10s; federal agent
758. Original TV show character; 10s; mobster
759. Original movie character ; 10s; thug
760. Original TV show character; 20s; attempted to put his garbage in neighbor's trash can
761. Original TV show character; 10s; had his half-sister brutally assaulted
762. Original TV show character; 10s;  owner of a black market pawn shop
763. Original TV show character; 10s; unaffected by effects of spiked wine
764. Original movie character ; 00s; senator
765. Original movie character; 10s; arrived late for internship
766. Original TV show character; 10s; criminal representative of robotics corporation
767. Original TV show character; 10s; security officer
768. Original movie character ; 10s; assigned to monitor major character
769. Original movie character ; 10s; artificial intelligence
771. Original movie character but named after real person ; 00s; priest
772. From a movie; based on comics; 10s; Deadpool; unable to feel pain
774. Original TV show character; 10s; attended an engagement related celebration
776. Original movie character; 10s; tortured children under his care
777. Original TV show character; 00s; has cyberkinesis and superhuman stamina
778. Original TV show character; 10s; has enhanced senses, particularly vision
779. Original TV show character; 10s; trained/prepared to become clan member
780. Original TV show character; 10s; musical director
781. Original TV show character; 10s; every Tuesday had tacos for lunch with husband
782. From a TV show; based on comics; 10s; New Mutants; hanged himself
783. Original TV show character; 10s; imprisoned by terrorists
785. From a movie; based on real person; 10s; world leader
786. Original TV show character; 10s; former crime leader
787. Original movie character; 10s; tribal leader
788. Original movie character; 10s; accountant
789. Original TV show character; 10s; former supporter of a foundation
790. Original TV show character; 10s; owner of a balloon stand
791. Original TV show character; 20s; festivites attendee
792. Original TV show character; 70s; pharmacist
793. Original TV show character; 10s; television producer
794. Original TV show character; 10s; henchman
796. Original TV show character; 10s; hate group leader
797. Original TV show character; 10s; physician
798. Original TV show character; 20s; has enhanced physiology
800. Original TV show character; 10s; assigned to guard major character
801. Original TV show character; 10s; incorrectly believed her husband had died
802. Original TV show character; 80s; ransacked an evacuated town
804. Original movie character; 00s; postal service worker
805. Original movie character; 20s; sorcerer
809. From a TV show; based on comics; 10s; Daredevil: Redemption; nurse turned killer
810. Original TV show character; 10s; decided with husband to adopt a child
811. Original TV show character; 80s; pitcher with college promises
812. Original TV show character; 10s; police officer tasked with keeping someone safe
815. Original TV movie character; 70s; interviewee
816. From a movie; based on comics; 00s; Wolverine: The Origin; shot by  groundskeeper
817. Original TV show character; 10s; scientist
818. Original TV show character; 10s; Corrections Officer
819. From a commercial; based on comics; 00s; Amazing Fantasy; watched another version of himself on TV
820. Original TV show character; 10s; stationed at aircraft carrier
821. Original TV show character; 10s; police officer
822. Original TV show character; 10s; former member of government agency
824. Original TV show character; 70s; hospitalized in serious condition due to a fight.
825. Original TV show character; 10s; establishment owner
826. From a commercial; based on comics; 10s; Amazing Fantasy; used bait to lure cirminal
827. From a movie; based on comics; 10s; Captain America; mercenary and pirate
828. Original TV show character; 20s; Air Force officer
829. Original TV show character; 10s; non-US mafioso
832. From a TV show; based on comics; 10s; Daredevil; boxer
833. Original TV show character; 20s; security guard
834. Original TV show character; 10s;  telekinetic
835. From a movie; based on comics; 10s; Spider-Man; mother of major character
836. Original TV show character; 10s; assigned to deliver alcohol to police officers
837. Original movie character; 00s;  security guard
838. Original movie character, though comics characters have the same code name; 10s; one such unrelated character from Fantastic Four; palace guard (name probably a descriptor but can be a code name)
839. Original TV show character; 20s; has enhanced physiology
840. Original TV show character; 10s; drill sergeant
841. Original TV show character; 10s; staff sergeant
842. Original movie character; 10s; military general

 

836 is correct. I'll see if more guesses accumulate before updating the list.

551 Lacont, F&WS

555 Fitzgibbon, GotG