Rat is often seen at school with Arale and her other classmates. His house is attacked by Dodongadon when the latter arrived in Penguin Village. Later, Rat is seen playing baseball with Taro Soramame, Akane Kimidori and Donbe, before following Arale and Gatchan with the other Penguin Village residents.
Rat is seen with Donbe and Nejishiki watching Arale racing the Gatchans just before General Blue and Goku come to town. He is seen again with Donbe when Goku asks him and Donbe whether they saw General Blue.
- Rat is similar to a character that previously appeared in Akira Toriyama's Today's Highlight Island manga, but without whiskers.