Top 20 Similar Marvel/DC Characters (Updated)

Batman (Bruce Wayne) first appeared in Detective Comics #27 (March 1939).
Iron Man (Tony Stark) first appeared in Tales of Suspense #39 (March 1963).

The Flash (Barry Allen) first appeared in Showcase #4 (October 1956).
Quicksilver (Pietro Maximoff) first appeared in the comic book X-Men #4 (March 1964).

Green Lantern (Hal Jordan) first appeared in Showcase #22 (October 1959).
Nova (Richard Rider) first appeared in Nova #1 (September 1976).

Lex Luthor first appeared in Action Comics #23 (April 1940).
The Green Goblin (Norman Osborn) first appeared in The Amazing Spider-Man #14 (July 1964).
The Joker first appeared in Batman #1 (April 1940).

Robin (Dick Grayson) first appeared in Detective Comics #38 (April 1940).
Bucky (James Barnes) first appeared in Captain America Comics #1 (March 1941), and returned from the dead as the Winter Soldier in Captain America #1 (January 2005).
Robin II (Jason Todd) first appeared in Batman #357 (March 1983), and returned from the dead as the Red Hood in Batman #635 (February 2005).

Deathstroke (Slade Wilson) first appeared in New Teen Titans #2 (December 1980).
Taskmaster (Tony Masters) first appeared in The Avengers #195 (May 1980)
Deadpool (Wade Wilson) first appeared in The New Mutants #98 (February 1991).

Darkseid first appeared in Superman's Pal Jimmy Olsen #134 (December 1970).
Thanos first appeared in Iron Man #55 (February 1973).

Catwoman (Selina Kyle) first appeared in Batman #1 (April 1940).
Black Cat (Felicia Hardy) first appeared in The Amazing Spider-Man #194 (July 1979).

Green Arrow (Oliver Queen) first appeared in More Fun Comics #73 (November 1941).
Hawkeye (Clint Barton) first appeared in Tales of Suspense #57 (September 1964).

Black Canary (Dinah Drake) first appeared in Flash Comics #86 (August 1947).
Mockingbird (Bobbi Morse) first appeared in Astonishing Tales #6 (June 1971).

Aquaman (Arthur Curry) first appeared in More Fun Comics #73 (November 1941).
Namor McKenzie first appeared in Motion Picture Funnies Weekly (April 1939).

The Atom (Ray Palmer) first appeared in Showcase #34 (October 1961).
Ant-Man (Hank Pym) first appeared in Tales to Astonish #27 (January 1962).

Clayface (Basil Karlo) first appeared in Detective Comics #40 (June 1940).
Sandman (William Baker, aka Flint Marko) first appeared in The Amazing Spider-Man #4 (September 1963).

Killer Croc (Waylon Jones) first appeared in Detective Comics #523 (February 1983).
The Lizard (Curt Connors) first appeared in The Amazing Spider-Man #6 (November 1963).

Lady Shiva (Sandra Wu-San) first appeared in Richard Dragon, Kung Fu Fighter #5 (December 1975).
Elektra Natchios first appeared in Daredevil #168 (January 1981).

Deadshot (Floyd Lawton) first appeared in Batman #59 (June 1950).
Bullseye first appeared in Daredevil #131 (March 1976).

Swamp Thing (Alex Olsen) first appeared in House of Secrets #92 (July 1971).
Man-Thing (Dr. Ted Sallis) first appeared in Savage Tales #1 (May 1971).

Parallax first appeared in Green Lantern #48 (January 1994) as a villainous Hal Jordan. Retconned in Green Lantern: Rebirth (October 2004) as a cosmic entity possessing Hal's body.
The Phoenix Force first appeared in Uncanny X-Men #101 (October 1976) as an empowered Jean Grey (later known as Dark Phoenix). Retconned in Fantastic Four #286 (January 1986) as a cosmic entity in Jean's likeness.

Crazy Jane (Kay Challis) first appeared in Doom Patrol #19 (February 1989).
Legion (David Haller) first appeared in New Mutants #25 (March 1985).

Superman (Clark Kent/Kal-El) first appeared in Action Comics #1 (June 1938).
Captain Marvel (Billy Batson) first appeared in Whiz Comics #2 (February 1940).

Captain Marvel, a.k.a. Shazam, was created by Fawcett Comics and is now owned by DC Comics.