Black Maria is one of the Tobiroppo, the strongest six Shinuchi of the Beasts Pirates.[5] She owns her own brothel on Onigashima near Kaidou's castle.[2]

Due to her actions and role, she is a supporting antagonist in the Wano Country Arc. Black Maria is a youthful woman of incredible size by human standards, yet still well-proportioned and slender. She is 8.2 meters tall[4], being slightly larger than Kaidou himself.[6][7] Her long blonde hair is styled like a geisha's, with two swords notably being part of its arrangement. Her eyes are sky blue, and a strand of hair tends to dangle in front of her left eye. She has a pair of long, slightly curved red horns atop her head, wears prominent lipstick, and carries a long smoking pipe.[5]

She wears a low-cut, black kimono that leaves her shoulders and cleavage exposed and a turquoise obi around her waist, both with blue and yellow floral patterns.[5] Her footwear is two black Zōri with red Hanao (straps) and white tabi (socks).[8]

After taking off her Kimono, she covered her breasts with Sarashi.

She has the kanji 女難 (jonan, meaning "woman trouble"?) tattooed on her back.[9] In her Zoan form, her spider forelimbs each bear a personalized Jolly Roger, indicating she may have them tattooed on her original body.[10] Black Maria is a flirtatious, courtesan-like figure who takes a laid-back approach to her missions and duties as one of the Tobiroppo. When assigned to fight or hunt for a target, Black Maria instead prefers to stay back from the action and enjoy the company of her captain or play music with her subordinates, taking refuge in safe locations away from all the strife while letting her peers deal with the problems themselves.[11] She also has a soft spot for children, taking pity on Momonosuke after he got brutalized by Kanjuro and tending to his injuries before Orochi took him away.[12] That being said, Black Maria can be just as violent and sadistic as the rest of the Beasts Pirates