|Fat Mutant Squirrel Risu|
|Height:||256 meters (standing)|
|Affiliation||The Hidden One|
Risu is a mutant male squirrel, presumably the mate of Ri. Although bigger and heavier, he is very fat and lazy and does not have the advantagfe of speed. The Hidden One, however, gave him gigantic fangs and reflective sheilds to fight the ultramen.