Ondori Clan Kaiken is a mercenary ronin for Ninja All-Stars. Ronin bring potent new abilities to a player's team that are entirely unique to them. As mercenaries, ronin may be used by any player, on any team. This makes ronin invaluable assets for every team, regardless of clan, since they may be used to supplement a team's weaknesses in battle or further augment their strengths.

Hidden in the forests and groves of northern Kagejima, the Ondori clan are mysterious and almost legend to most of the island. They only occasionally trade with, or even contact, their nearest neighbors. Those who do interact with them describe the Ondori as proud, fiery, and surprisingly well-informed. In the last century, more and more of these enigmatic shinobi have appeared and bargained their services to other clans for the Moonlight Tournament. With flashing claws and a sharp beak, they challenge all who stand in their way with their unique fighting style that baffles opponents and allies alike.