Two Face (Harvey Dent) Created by Bob Kane and Bill Finger, Two Face first appeared in Detective Comics #66 (August 1942).
The Joker Created by Bill Finger, Bob Kane and Jerry Robinson, The Joker first appeared in Batman #1 (Spring 1940).
Iron Man (Tony Stark) Created by writer-editor Stan Lee, scripter Larry Lieber, and artists Don Heck and Jack Kirby, Iron Man first appeared in Tales of Suspense #39 (March 1963).
Cable (Nathan Summers) Created by writer Louise Simonson and artist/co-writer Rob Liefeld, Cable first appeared in The New Mutants #87 (March 1990).
Wolverine (Logan) Created by writer Len Wein and Marvel art director John Romita Sr., Wolverine first appeared in the final "teaser" panel of The Incredible Hulk #180 (cover date October 1974) then in a number …
Gambit (Remy LeBeau) Created by writer Chris Claremont and artists Jim Lee and Mike Collins, Gambit first appeared in Uncanny X-Men #266 (August 1990)