Cas is an interactable NPC in Oh So Hero!

When Joe arrives at his cabin, he asks Cas for help with the indestructible blocks in Treewish Forest, with Cas replying that he has some machines but that they require some expertise to use. After seeing the disappointment in Joe, he allows him to take anything, within reason, from his cabin that he might find useful, this is how Joe acquires the Ass Masters: Limited Edition book.

Before arriving, Ket mentions Cas as a “nice guy” that could lend him some tools to deal with the aforementioned blocks.

He is a beaver. His outfit is an open orange puffy vest and a pair of denim hot pants (which appears to highlight a large bulge), with extra thick round glasses over his eyes.

He's most likely an otaku, given that he is quick to fluster, has a range of Isadora posters and body pillows, and has a cliché nerdy look to him.

Cas can be found at his cabin at the right-most side of the Southeast Beach. It is unknown what his relationship is with K.ren who he shares the location with, or with Bryce who can be found right outside his cabin.

• He is one of the only two NPCs who has an animated idle sprite. The other being Ket.
• Cas's name might be short for Castor, which is Beaver in Spanish.