In these pages? Shin, Fuu, Asshat, and some mind-controlled bitch.
Shin is Aya's crazed brother who nearly kills large numbers of his friends. Fuu is the poor sap who loses more pieces of himself every time he fights until he's basically a walking skeleton. Asshat's the wussy one who hides behind walls of chicks, except when he shows up as suddenly awesome in the tournament. Random bitch just looks pretty and tsunny until Nevada-tan turns her into a mindslave.