The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Kairi (1 member)
- Kameo darrius (1 member)
- Kano (2 members)
- Kano (Kameo) (4 members)
- Kano (Mortal Kombat) (2 members)
- Karasu (Ninja Master's) (117 members)
- Karin (20 members)
- Kasumi (2 members)
- Kasumi (Ninja Master's) (57 members)
- Kasumi Todoh (3 members)
- Katar (1 member)
- Katars (8 members)
- Kazuya (1 member)
- Kazuya Mishima (8 members)
- Ken (604 members)
- Kenshi (2 members)
- Khameleon (5 members)
- Killer Instinct (12 members)
- Killer Instinct (2013) (35 members)
- Killer Instinct 2013 (64 members)
- Kim (5 members)
- Kim Kaphwan (88 members)
- Kimberly (70 members)
- King (50 members)
- King Dedede (1 member)
- King of Fighters characters (2 members)
- Kirby (1 member)
- Kitana (2 members)
- Kokoro (2 members)
- Kula Diamond (1 member)
- Kuma (9 members)
- Kung Lao (7 members)
- Kurow Kirishima (61 members)
- Kyo (57 members)
- Kyo Kusanagi (182 members)
- Kyoko Minazuki (51 members)
- Kyoshiro Senryo (1 member)
- Kyosuke (5 members)
- Kyosuke Kagami (59 members)
- La Mariposa (2 members)
- Lance (9 members)
- Lars Alexandersson (6 members)
- Last Blade 2 (0 members)
- Laurence (1 member)
- Laurence Blood (125 members)
- Lee Chaolan (6 members)
- Legal notices (1 member)
- Legends (181 members)
- Lei Lei (Hsien Ko) (50 members)
- Lei Wulong (15 members)