Miss Monday is a Baroque Works agent, and a secret guardian of Nefertari Vivi. Miss Monday is a muscled big woman, therefore, even her voice seems male. Due to her huge muscles, Miss Monday can attack her opponents with brute force, making her a tough rival.
Kairiki MerikenKanji: カイリキメリケン
Translation: Superhuman Strength Knuckle
Miss Monday pins her opponent down then bashes her opponent's head in with the combination of her insane strength and a handy set of brass knuckles.