Sorted alphabetically by last name · 2715 fighters
| Name | Nickname | |
|---|---|---|
| KS | Karine Silva | "Killer" |
| KR | Karl Roberson | "Baby K" |
| KW | Karl Williams | |
| KV | Karlos Vemola | |
| KP | Karo Parisyan | "The Heat" |
| KR | Karol Rosa | |
| KK | Karolina Kowalkiewicz | |
| KC | Katlyn Cerminara | "Blonde Fighter" |
| KF | Katsuhisa Fujii | "Shamoji" |
| KK | Katsunori Kikuno |