Just super-heroes and super-villains, so no one like Captains, Savage, Fear, Compass or Kirk.
- Capitaine Kebec I
- Capitaine Kebec II (Josée)
- Capitaine Souche
- Capitan Chile
- Capitan Furia
- Capitan Italia (Caesar)
- Capitan Jupiter (Rex Vane)
- Capitan Novara (Luca Ferrari)
- Capitán Vengador
- Capitão Brãs
- Capitão Brasil
- Capitão 7 (Carlos)
- Cap'n Quick
- Captain Action (Clive Arno)
- Captain Aero “DC”
- Captain Africa
- Captain Albion “Marvel”
- Captain Amazing
- Captain America I (Steven Rogers) “Revolutionary War”
- Captain America II (Isaiah Bradley)
- Captain America III (Steve Rogers)
- Captain America IV (Grant Gardner) “1940’s Serial”
- Captain America V (William Naslund)
- Captain America VI (Jeff Mace)
- Captain America VII (William Burnside)
- Captain America VIII (Roscoe Simons)
- Captain America IX (John Walker)
- Captain America X (Carol Danvers) “Marvel Mangaverse”
- Captain America XI (Bucky Barnes)
- Captain America XII (Sam Wilson)
- Captain America XIII (Danielle Cage)
- Captain America XIV (Samantha T. Wilson)
- Captain America XV (Peggy Carter) Exiles (vol. 3) #3
- Captain America XVI (Roberta Mendez)
- Captain America XVII Sharon Rogers)
- Captain America XVIII (Aaron Fischer)
- Captain America XIX (Arielle Agbayani)
- Captain America XX (Nichelle Wright)
- Captain America XXI (Joe Gomez)
- Captain America XXII (Miles Morales) What If? Miles Morales
- Captain America XXIII (Gwen Rogers) Spider-Gwen:Gwen-Verse
- Captain America XXIV (David Colton)
- Captain America Junior (Freddy Rogers)
- Captain Americat (Steven Mouser)
- Captain Assyria
- Captain Atlas I (Honeywell)
- Captain Atlas II (Att-Lass)
- Captain Atom I (Rador)
- Captain Atom II “Nation-Wide Publishing”
- Captain Atom III (Nathaniel Adam)
- Captain Attack “Mystery Men”
- Captain Australia
- Captain Austria Junior (Kurt Kogler)
- Captain Avenger (Steve Nichols)
- Captain Axe
- Captain Barbell (Enteng)
- Captain Battle (John Battle)
- Captain Battle Junior (William Battle)
- Captain Black (Conrad Turner)
- Captain Boomerang I (Digger Harkness)
- Captain Boomerang II (Owen Mercer)
- Captain Brazil “Marvel”
- Captain Britain I (Brian Braddock)
- Captain Britain II (Kelsey Leigh)
- Captain Britain III (Betsy Braddock)
- Captain Bubble (Marie Fricker)
- Captain Cadaver (Mister Swartzburg)
- Captain Calamity “DC”
- Captain California “Hero High”
- Captain Canada (Daniel Eaton)
- Captain Canuck I (Tom Evans)
- Captain Canuck I (Darren Oak)
- Captain Canuck III (David Semple)
- Captain Capacitor (Gavin Capacitor)
- Captain Carrot (Rodney Rabbit)
- Captain Carter (Peggy Carter) What If (TV)
- Captain Caution
- Captain Caveman (Chester)
- Captain Celebrity (Christopher Skyline)
- Captain Chaos (Victor Prinzim)
- Captain China (Li Feng)
- Captain Clyde (Chris Melville)
- Captain Cold (Len Snart)
- Captain Combat
- Captain Comet (Adam Blake)
- Captain Commando (John Grayson)
- Captain Confederacy I (Jeremy Grey)
- Captain Confederacy II (Kate Williams)
- Captain Conquest (Flash Dale)
- Captain Courageous
- Captain Crash
- Captain Crusader
- Captain Cutlass “DC”
- Captain Demo “DC”
- Captain Desmo "DC"
- Captain Dynamic
- Captain England “Marvel”
- Captain Euro (Adam Andros)
- Captain Everything
- Captain Fate (Jebediah Fate)
- Captain Fearless (John Fearless VI)
- Captain Fight (Jeff Crockett)
- Captain Flag (Tom Townsend)
- Captain Flame (Frank Cortez)
- Captain Flash (Professor Keith Spencer)
- Captain Flower (Freddie)
- Captain Freedom I (Don Wright)
- Captain Freedom II “Atlantis GN”
- Captain Future (Andrew Bryant)
- Captain Glory
- Captain Handsome (John Dough)
- Captain Hawk (James Dore Junior)
- Captain Hero I (Jughead Jones)
- Captain Hero II Drawn Together
- Captain Heroic I (Bruce Clark)
- Captain Heroic II “Evil, Inc.”
- Captain Hip (Fred MacRae)
- Captain Hornet
- Captain Hot Wheels (Billy Car)
- Captain Incredible
- Captain Invincible The Return of Captain Invincible
- Captain Israel "Stand With Us"
- Captain Justice I (Brad Steele)
- Captain Justice II (Lance Harwood)
- Captain Justice III (Doug)
- Captain Katseye
- Captain Kentucky (Lancelot Pertwillaby)
- Captain Kerosene (Gulliver Jones)
- Captain Klutz (Ringo Fonebone)
- Captain Krakoa (Scott Summers)
- Captain Krunch (Steve Crisp)
- Captain Kwik (Apu Nahasapeemapetilon)
- Captain Lash “DC”
- Captain Liberty “The Tick”
- Captain Liechtenstein “Marvel”
- Captain Magnet (Johnny Calhoun)
- Captain Marvel I (Billy Batson)
- Captain Marvel II (Roger Winkle)
- Captain Marvel III (Mar-Vell)
- Captain Marvel IV (Monica Rambeau)
- Captain Marvel V (Billy Mar-Vell) “Amalgam”
- Captain Marvel VI (Marvin Ellwood)
- Captain Marvel VII (Genis-Vell)
- Captain Marvel VIII (Noh-Varr)
- Captain Marvel IX (Carol Danvers)
- Captain Marvel X (Mar-Vell/Gwen Jones) Spider-Gwen: Gwen-Verse
- Captain Marvel Junior (Freddy Freeman)
- Captain Mephisto (Frederick Braley)
- Captain Massachusetts
- Captain Mega Meat Futurama
- Captain Metropolis (Nelson Gardner)
- Captain Midnight (Jim "Red” Albright)
- Captain Might (Professor Alan English)
- Captain Milksop (Mortimer X. Mortimer)
- Captain Miracle
- Captain Mizuki One-Punch Man
- Captain Nazi (Albrecht Krieger)
- Captain Newfoundland
- Captain Nice (Carter Nash)
- Captain Paragon
- Captain Phantom (Ralph Daunton)
- Captain Planet
- Captain Power (John Grant)
- Captain Red Cross (Hank Greer)
- Captain Satan (Cary Adair)
- Captain Science (Gordon Dane)
- Captain Snack
- Captain Spider (Flash Thompson)
- Captain Squid “Superior Squad”
- Captain Stingaree (Karl Courtney)
- Captain Strong (Horatio Strong)
- Captain Super
- Captain Swift "Freedom Brigade"
- Captain Terror (Dan Kane)
- Captain Thunder I (Willie Fawcett)
- Captain Thunder II “Hero Comics”
- Captain Tootsie
- Captain Triumph I (Lance and Michael Gallant)
- Captain Triumph II “Freedom Fighters”
- Captain Truth (Ken Elliot)
- Captain U.K. (Linda McQuillan)
- Captain Ultra (Griffin Gogol)
- Captain Underpants (Seymour Krupp)
- Captain Universe I (Ann Dodgson)
- Captain Universe II (Clare Dodgson)
- Captain V (Alan Dale)
- Captain Valiant (Bruce Barton)
- Captain Valor (Milo Stone)
- Captain Victory I (Jack Wilson)
- Captain Victory II “Galactic Rangers”
- Captain Video
- Captain Vigilant
- Captain Vincible
- Captain Whale
- Captain Whoosh
- Captain Wizard (Joseph Preston)
- Captain Wonder I (Bob Victor)
- Captain Wonder II (Jeff Jordan)
- Captain Wonder III (Steve Trevor/Dr. Psycho)
- Captain X (Buck Dare)
- Captain Yesterday (Philip J. Fry)
- Captain Zenith
- Captain Zero (Lee Allyn)
- Captain Zoom (Brian Hardy)
- Hauptmann Deutschland (Markus Ettlinger)
- Hauptmann Englande (Brian Braddock)
- Kapitan Aksiyon (Gabriel)
- Kapitan Kidlat (Innocencio Santos)
- Kapteeni Hyperventilaatorimies (Sidney Applebaum)
- Kapteeni Kuolio (Veikko Eloranta)
- Kapten Bandung (Uden Alif Suharja)
- Kapten Halilintar (Reggy)
- Kapten Stofil (Joakim Lindegren)
- Kapten Surya (Sasurya)
- Kapten Sverige (Humphrey Tagelberg)
- Kapten Zzzboom
Replies
Added Captain Desmo.
You won't be able to use this one as I can't find evidence, but I remember an Australian TV ad for potato crisps of the 1970s or 1980s that featured a superhero called Captain Snack. The ad depicted him using comics-style panels. He wore a Superman-ish costume with a cape and goggles. I can still hear the announcer, "Hooray for Captain Snack!"
A shame, he sounds awesome. I couldn't find anything about him, either. I did stumble across an obscure American cereal mascot called "Captain Snack", so I guess I'll add him.
I still can't find the ad, so I don't think I've nailed it down, but this article about an Australian motorcycle race mentions the character: "Coca-Cola Amatil were about to launch Captain Snack Potato Crisps – Captain Snack being a caped crusader attired in bright yellow with blue trim."
Cool. Interesting stuff.