Taking care of four characters at once since each of them alone might be of minimal use: 4, W, 1, X

Letters/numbers found so far: GQWX14

731. Comics (indirectly); criminal if any; Daring New Adventures of Supergirl; *** (******** ********)
732. Original; geology professor *. *****
733. Original; philosophy student ******* ********
734. Original; security agent ******
735. Real person; military officer ******* *****G* (one letter has accent)
736. Original; none G***** (**** *****)
737. Original; businessman ***** ****
738. Original; musician ******
739. Original; unrevealed ***. *******
740. Original; psychiatrist, crime boss **. W***
741. Original;  bartender to the extent applicable *** (******** ********)
742. Earlier character this continuity; unrevealed to the extent applicable  **** (******** ********)
743. Original; serial killer **** *** *****
744. Comics (at least code name); bank robber; Justice League of America *** (****** ***** ***** G**G)
745. Original; police detective ********* *****
746. Comics; criminal; The Flash **** ******* (********)
747. Original; computer programmer *** *W**
748. Comics; soldIer and government agency director turned terrorist; Adventures of Superman *****G ******** / **** ******W
749. Original; businessman **. G******
750. Original; bearer of some sort of item ***** *** ***** ******
751. Original, but likely named after crew member; scientist/cultist *. *****
752. Comics; assassin; Titans, though at least one earlier character used the same code name **********
753. Original; student if any when last seen **
754. Original; unrevealed ****** *****
755. Original; club owner/illegal technology dealer ********
756. Original (Arrowverse claims a comics connection but it's a reach) but related to comics based character; socialite; if going by Arrowverse claims, Huntress ****** **********
757. Original; professional bowler **** *** ******
758. Comics; some sort of overseer; The Multiversity Guidebook *********** ***
759. Original