Shimotsuki Ryuma

Ryuuma is a Zombie General who looks like samurai. He appears to have some kinda of tie with Brook.

Appearance
Ryuuma is apparently the same height as Brook. However unlike Brook, he dresses in a samurai Gi and has no afro. More distinctive is that he has skin and flesh covered over his bones. Hogback states that this flesh is apparently special.

Personality
Ryuuma appears to have the same personality as Brook from Brook's pervertive nature to Brook's own distinct laugh of "Yo ho ho". This similarity has been noted by several characters. It is currently unknown what true relationship he has with Brook.

History
According to Hogback, Ryuuma hails from the Wano Country in the New World. He is apparently famous for killing a dragon. At some point in time, he apparently died and was reanimated by Hogback to be a guardian of sorts.

While apparently doing his rounds on the night the Straw Hats came to Thriller Bark, Ryuuma decided to chase after Usopp, Nami, and Chopper after they were chased out of Hogback's room by a Jack in a box. He caught up to them while they were peeking on Hogback making his latest creation in his lab. He then knocked them inside with what appeared to be slash.

Ryuuma was then ordered by Hogback to do away with the three. He then knocked Usopp, Nami, and Chopper away with a single move that was so powerful that they didn't even realized they were attacked. Only when Ryuuma walked 10-feet away to converse with Cindry and the three try to escape did they realize the attack.

Pre One Piece Ryuuma
Ryuuma's character design, past, and even name appear to be based on a character from one of Oda's earlier works, Ryuuma the King. The Ryuuma of this earlier work was a samurai who resembled Zoro and the main protagonist of the one-shot comic.