If you are looking for the teenage kraken, see Ruby Gillman.
Ruby is an annoying as f*ck mouse who lives in the house of Big and Small free of charge. Her temper and attitude are, well, bad, especially when forced to play the tuba, which causes her cheeks to substantially expand.
Ruby often likes to easily get away with taking some of Small's cheese, because she likes cheese, being a mouse. She often uses it as a weapon whenever she is caught eating it, while hiding in her dirty, messy mousehole of doom, where she plots shifty, esoteric schemes. Ruby also likes to eat living pieces as cheese. How EVIL.
Ruby is also mentally ill, once mistaking SpongeBob SquarePants as a piece of cheese, and tried to eat him once, which is what her idiotic, sick little rat brain told her to. It is unknown if Ruby was one of Albert Einstein's lab rats or not.