Serena O'Riley by @Dark_Maiden_Kira (Jessica Gonzalez)

Serena is a reploid created by a female Irish scientist named Elizabeth O’Riley. Though she is young and a bit immature, she is trained in the martial arts and lethal in battle. She can transform into a cat to gain access to small areas, and has some cat mannerisms. She also has a crush on X, since she works with him on missions frequently.