Rudy is Jibanyan's former living self before he got hit by a truck. He bears a similar appearance to Jibanyan, even if resembling a more normal cat. Rudy is a red and white kitten wearing a gray collar with a blue tag on it. The tag is as shiny as a crystal.
Despite being Jibanyan's living self, Rudy is one rank higher than Jibanyan is currently. Jibanyan may be considered weaker post-death.
Technically Rudy shouldn't be a Yo-kai, as he's still alive, and Jibanyan only became a Yo-kai after death. This is likely because when Rudy died, his soul came out and became Jibanyan, the corpse still remained, implying corpses can still move in the yo-kai World, implying more yo-kai such as Rudy might do the same, although this is still not comfirmed.
The names Rudy and Akamaru describe the red color of Jibanyan.