Rosie

Rosie (ロジー, Rojī; Viz: Rogi) was a martial artist and user of the Psycho Analysis Martial Arts.

Appearance
Rosie is a young man with light colored eyes and hair that is parted to the left and has an undercut. He wears a grey suit with a white shirt underneath and a diamond patterned tie.

After eating the Monster Cells he grew more muscular and larger in size, also having some protrusions sticking from his back.

Personality
Rosie is very ambitious and plans to revolutionize psychology and logic in martial arts. Deep inside, he is huge coward who easily willing to do anything to survive, even if it means abandoning his martial art style and his own humanity for the sake of surviving as he is the first one to rush to eat the Monster Cell.

As a monster, he is quite vengeful and sadistic since he beats a heavily injured Dave to avenge his humiliating defeat in the first round of the tournament.

Monster Raid Arc
Rosie is participating in the Super Fight Tournament in C-City at the C-City Super Stadium. This is the first time Rosie has participated in the tournament. While watching the match between Max and Suiryu, he was shocked by the strength of the latter, easily defeating his opponent. He was matched and defeated by Dave without much difficulty.

Monster Association Arc
As he was being taken to the hospital, The Three Crows took him hostage and brought him back to the stadium, along with Dave and Bazuzu.

Rosie and the martial artists were given an offer by Gouketsu to either eat the Monster Cells and join the Monster Association or die. Rosie was the first to eat it and after becoming a monster, he sadistically throws a heavily injured Dave into the distance to avenge his defeat in the tournament. However, his victory is short live since Choze quickly snaps his neck, killing him.

Fighting Style
Psycho Analysis Martial Arts (心理分析格闘戦術, Shinri Bunseki Kakutō Senjutsu; Viz: Psychoanalytic Martial Arts): Has not been shown yet. He analyzes his foe's psychology and turns it in his favor. This style is actually useless in the fight since he was crushed by Dave in mere seconds before he can even react. It is worth noting, however, that since Dave's style is simply crushing people, it is possible it at least doesn't work on extremely simplistic styles like that one.