Cattus appears to BoBoiBoy and his friends in Episode 4, showing that it was a bit thirsty. Despite Gopal's protests to conserve water, BoBoiBoy offers his own drink to Cattus, causing the cat to warm up to him.
Being a feline-like animal, Cattus behaves much like a cat on Earth would act, however much more aggressive. Cattus is shown to be very affectionate to people who help take care of it, most notably BoBoiBoy. In a short time, Cattus was able to bond with him and grew angry when he had taken a hit for it. Cattus also has a strong bond with Bellbot, who hangs around it's neck.
Other times, Cattus can be moody, picking and choosing it's fights and not always jumping in when it needs to.
- A natural ability that Cattus has is it's ability to disguise itself as a cactus by burrowing underground, it's tail acting as a cactus.
- Size Enlargement - Due to being the 'owner' and defender of BellBot, Cattus has the power to super size itself to a monstrous size, usually when it's angry.
- Its name Cattus is a combination of "cat" and "cactus".
- Unlike Earth's cats, Cattus only eats rattan wood as revealed in Episode 5.
- It's revealed in fanmails that BoBoiBoy doesn't know about Cattus' gender nor has it formally be revealed in the show.