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.
According to Jibanyan’s flashback, he mostly slept all day and had no real personality outside of that.
In Red Cat Corps, the player must have Jibanyan as the leader and beaten Chapter 5-4 and Usapyon Mission. After doing so, Rudy will make a phone call to you. The mission will involve Jibanyan beating a Baddinyan, Thornyan, Robonyan, Machonyan, Shogunyan, Dracunyan, Sailornyan, Wondernyan, Jetnyan and Rudy in an Battle Royale on school outside at night. After a cutscene (where Whisper wakes Jibanyan in roof, only to find out that the whole events was a dream.), Rudy will appear and befriend you.