720 Tommy Puck, Superboy

Cleaned up clues:

680. From a TV show; based on comics; 10s; Strange Adventures; sided with heroes against the government organization he was part of after learning of its corruption
695. From a TV show; based on comics; 20s; doublecrossed main characters
714. From a movie; based on comics; 00s; All-Star Comics; seen in mostly non-superhero comedy
763. From a TV show; based on comics; 20s; The Flash; former technician
774. From a TV show; based on comics; 90s; Fury of Firestorm; can do a specific type of energy attack
785. From a TV show; based on comics; 20s; Batman: Shadow of the Bat; secret society member
788. Original TV show character; 60s; kidnapped millionaire
829. From a TV show; dressed as someone based on comics; 00s; All-Star Comics; seen at a convention
833. Original TV show character; 00s; environmental activist
856. From a TV show; indirectly based on comics; 60s; Action Comics; specialized mechanic of sorts
873. From a TV show; based on comics; 10s; Young Justice; tried to prevent villain from coming to Earth
888. From a TV show; based on comics (slightly different first name); 10s; Justice Society of America; sent to prison for curing people with powers
921. From a commercial; based on comics; 70s; Action Comics; seen at home
1066. Original TV show character; 10s; father of major character

Tally
Black Lightning    2
[commercial for something blue]    1
Batman (1960s)    1
Batwoman    1
[non-DC comedy series]     1
Flash modern    1
Gotham    1
Legends of Tomorrow    1
[non-DC comedy movie]    1
[world famous non-DC comedy series]    1
Smallville    1
Stargirl    1
Titans    1

a. One comics based character is missing the comic they debuted in; that is not an oversight on my part.
b. In the tally, consider where the obscured sources are placed.
c. One comics based character was played by someone who went on to be far better known playing another comics based character.
d. One comics based character was originally depicted as from the future in the comics but that was never the case on the show..
e. One character is a counterpart of a cast character.
f. The character from Stargirl has been seen in the season currently airing but debuted earlier.
g. One 20th century character has a 21st century counterpart at least in name.
 

Nevermind. 833 Janice Caulfield, Gotham

1066 James Chapel, Stargirl ?

785 Jeremiah Arkham, Batwoman

Cleaning up clues:

680. From a TV show; based on comics; 10s; Strange Adventures; sided with heroes against the government organization he was part of after learning of its corruption
695. From a TV show; based on comics; 20s; doublecrossed main characters
714. From a movie; based on comics; 00s; All-Star Comics; seen in mostly non-superhero comedy
763. From a TV show; based on comics; 20s; The Flash; former technician
788. Original TV show character; 60s; kidnapped millionaire
829. From a TV show; dressed as someone based on comics; 00s; All-Star Comics; seen at a convention
856. From a TV show; indirectly based on comics; 60s; Action Comics; specialized mechanic of sorts
921. From a commercial; based on comics; 70s; Action Comics; seen at home

Tally
[commercial for something blue]    1
Batman (1960s)    1
Black Lightning    1
[non-DC comedy series]     1
Flash modern    1
Legends of Tomorrow    1
[non-DC comedy movie]    1
[world famous non-DC comedy series]    1


a. One comics based character is missing the comic they debuted in; that is not an oversight on my part.
b. In the tally, consider where the obscured sources are placed.
d. One comics based character was originally depicted as from the future in the comics but that was never the case on the show..
g. One 20th century character has a 21st century counterpart at least in name.

 

763 Pytor Orloff, Flash modern

Just to clarify for 788 - when you say "kidnapped millionaire," do you mean he is a kidnapped millionaire, or he kidnapped a millionaire?

Latest answers correct; list updated. In the letter clues, Grayle is d (originated in the Atomic Knights stories) while Booster was a (the guy I didn't want to list the debut comic for since he first appeared imn his own title).

Additional clues

714. From a movie; based on comics; 00s; All-Star Comics; seen in mostly non-superhero comedy; the actress playing her is definitely Shy
788. Original TV show character; 60s; was a kidnapped millionaire; counterpart in a 21st century show or movie was previously identified either in part 1 or part 2
829. From a TV show; dressed as someone based on comics; 00s; All-Star Comics; presumed cos-player at a comics convention
856. From a TV show; indirectly based on comics; 60s; Action Comics; specialized mechanic of sorts; has two names, will accept either or both
921. From a commercial; based on comics; 70s; Action Comics; seen at home; breaks the fourth wall to sell the product.

Tally
[commercial for something blue]    1
Batman (1960s)    1
[non-DC comedy series]     1
[non-DC comedy movie]    1
[world famous non-DC comedy series]    1

 

For obscured ones in the tally, adding the number of words in the movie title. series title/episode or skit title (hyphenated words treated as one word), or brand of product

[commercial for something blue used mainly in one room of a dwelling]; 2   1
Batman (1960s)    1
[non-DC detective comedy series]; 3/3     1
[non-DC romantic comedy movie set in a specific city] 4   1
[world famous non-DC skit comedy series]  4/2 or 3 (sources conflict)   1
 

788 Pete Savage, Batman

For the next few days I won't volunteer any new clues (needing a lot of lead time for gathering names for the Marvel Live Update series which will start after part 4) but will answer up to 20 questions a day.

Starting on the Hangman clues. Since in one instance this will make the series pretty obvious, I'll now need the episode or skit title for shows. All are Character / Source.

714. From a movie; wears costume based on comics; 00s; All-Star Comics; seen in mostly non-superhero comedy; the actress playing her is definitely Shy; struggling actress' ********* ****** ***** / ******** ** *** *******
829. From a TV show; dressed as someone based on comics; 00s; All-Star Comics; presumed cos-player at a comics convention; non-speaking role ****** ***** / ***** ** *****: ***** *** ** ******
856. From a TV show; indirectly based on comics; 60s; Action Comics; specialized mechanic of sorts (land vehicle); has two names, will accept either or both *. *. ******** a.k.a. ******* ****** *** / ***** ******'* ****** ******: ******* ****** ***
921. From a commercial; based on comics; 70s; Action Comics; seen at home; breaks the fourth wall to sell the product; no other characters are in the commercial. ******** / **** *****

Tally
[commercial for something blue used mainly in bathroom]   1
[non-DC detective comedy series]    1
[non-DC romantic comedy movie set in a specific city]    1
[world famous non-DC skit comedy series]  1
 

Adding the letters D and F. Letters found so far: DEF

714. From a movie; wears costume based on comics; 00s; All-Star Comics; seen in mostly non-superhero comedy; the actress playing her is definitely Shy; struggling actress' ***E****E ***DE* ***** / ***E*E** ** *** ***E*E*
829. From a TV show; dressed as someone based on comics; 00s; All-Star Comics; presumed cos-player at a comics convention; non-speaking role "***DE* *****" / ***ED ** *E***: ***E* *** ** ******
856. From a TV show; indirectly based on comics; 60s; Action Comics; specialized mechanic of sorts (land vehicle); has two names, will accept either or both F. *. ***E**** a.k.a. ******E *E**** *** / ***** ******'* F***** ******: ******E *E**** ***
921. From a commercial; based on comics; 70s; Action Comics; seen at home; breaks the fourth wall to sell the product; no other characters are in the commercial. ***E**** / **** *E***

Tally
[commercial for something blue used mainly in bathroom]   1
[non-DC detective comedy series]    1
[non-DC romantic comedy movie set in a specific city]    1
[world famous non-DC skit comedy series]  1


One is from a British source
One is played by an actor whose surname is a synonym for vacation
For the remaining two, if you try searching specifically for lesser known versions of the character, you'll probably find them both pretty quickly.