Iris Streambattle was a female otter who was Rab Streambattle's mate. She was a excellent fighter with a javelin, and was a perfect shot with a bow and arrows, though she used her sling in the fight when her mate was captured.
During Rab's absence, she took command of Castle Floret's otter guard, and successfully helped to free Dandin, Gael Squirrelking and Meldrum from Urgan Nagru and his horde. It was the sight and sound of her calling out his name that helped Rab regain his memory.