K
- Kaine - dead
- Kang the Conqueror
- Karen Grant (Jean Grey)
- Karma (Mahn, Xi'an Coy)
- Karnak
- Ka-Zar
- Kenny "King Kong" McFarlane
- Kingpin (Fisk, Wilson) - dead
- Kraven The Hunter (Kravinoff, Sergei) - dead
- Kree
Read more about this topic: List Of Ultimate Marvel Characters