C
- Cable (Future Version of Wolverine) - location unknown
- Callisto
- Camelliia
- Cannonball (Guthrie, Sam) - dead
- Captain America (Rogers, Steve)
- Captain Atlas
- Captain Britain (Braddock, Brian) - dead
- Captain France (Etherlinck, Hugo) - dead
- Captain Italy (Landi, Umberto) - dead
- Captain Mahr Vehl (Pluskommander Geheneris Halason Mahr Vehl)
- Captain Spain (Fraile, Carlos) - dead
- Captain UK
- Carnage - fused with Venom, currently Gwen Stacy
- Carol Danvers
- Cathrine Mora
- Chameleon
- Chitauri
- Clay Quartermain
- The Colonel (Al-Rahman, Abd) - dead
- Colossus
- Contessa Valentina Allegra di Fontaine
- Crystal
- Cyclops
Read more about this topic: List Of Ultimate Marvel Characters