Here's Ryuutarou's son students.

Kohaku's an expert of the mankiri chain.

Dai is the brawler of the gang. His fists are deadly and he can take a bunch of hits.

Ayako is the throwing weapons expert... and she has a way to have an edge over her opponents

Shigeo, as cute and fluffy he looks like, he's probably the mst dangerous of the four.

I made them for  goliathcpg so you can see those trouble makers on his page.