Cattus

Cattus is a feline cactus alien that resided on Planet Gurunda prior to following BoBoiBoy's gang and joining TAPOPS. Cattus' first appearance is a cameo in "Planet Gurunda Exploration", with his formal debut coming in "The Cute Giant Cattus".

"Planet Gurunda Exploration"
At the end of the episode, a cactus patch in front of the camera moves across the screen. The cacti resemble Cattus' tail.

"The Cute Giant Cattus"
Cattus approaches the gang at their Gurunda campsite, eyeing BoBoiBoy's cup of water. Despite Gopal's protests to conserve water, BoBoiBoy offers his own drink to Cattus, causing the cat to warm up to him. When Gopal keeps protesting, eventually the cat gets fed up and scratches him.

Waibi refers to the cat as the monster in the episode. Moments after this revelation, Cattus is nearly shot by Adu Du's tranquilizer dart, forcing BoBoiBoy's gang to come to its protection. BoBoiBoy takes a tranquilizer dart for the cat, enraging it to the point of activating its ability to enlarge into a monstrous size. This is when Ochobot realises that Cattus has a Power Sphera around its neck. Yaya and Ying try to protect it, but are stopped by Probe.

It is then revealed that Cattus still has catlike behaviour despite being in its beast form, which Adu Du takes advantage of to trap it. Adu Du and Probe are driven off by BoBoiBoy, who is now conscious. After Cattus is saved, Ochobot explains that the cat's collar is actually BellBot. BellBot reveals himself and explains his and Cattus's story.

At the end of the episode, Cattus follows BoBoiBoy's gang to TAPOPS. There, Koko Ci accidentally steps on its tail and enrages the cat.

"BoBoiBoy Leaf VS The Pirates"
Cattus first appears interrupting BoBoiBoy and his friends' discussion on his malfunctioning Power Band. It refuses the cat food Gopal transforms for it. When the group asks about its diet, Bellbot reveals he doesn't know, and the gang concludes the cat must want fresh fish.

When the team heads to Papa Zola to get Cattus some fish, Cattus is revealed to have an appetite for rattan baskets. It takes a liking to Papa Zola despite the fact that its actions laid waste to Papa Zola's fishing. Papa Zola decides to adopt the cat.

Later, Gopal turns the robotic bodies of Captain Separo's minions into rattan baskets, causing Cattus to viciously attack and easily dispatch the robots. At the end of the episode, a hungry Cattus attacks Gopal again after he insults its appetite.

Personality
Being a feline, Cattus behaves much like a cat on Earth would act, albeit more aggressive. Cattus is shown to be very affectionate to people who help taking care of it, most notably BoBoiBoy and Papa Zola. In a short time, Cattus was able to bond with BoBoiBoy and grew angry when he had taken a hit for it. Cattus also has a strong bond with BellBot, who hangs around its neck.

When it wants something, it makes cute eyes to beg for it. When it's angry, the thorns on its tail will stand up. Other times, Cattus can be moody, picking and choosing it's fights and not always jumping in when it needs to.

After being long with Papa Zola, Cattus is shown to imitate his actions occasionally as shown in Episode 13.

Relationships
Main article: Cattus/Relationships

Abilities

 * A natural ability that Cattus has is its ability to disguise itself as a cactus by burrowing underground, its tail acting as a cactus.
 * Size Enlargement - Due to being the 'owner' and defender of BellBot, Cattus has the power to supersize itself to a monstrous size, usually when it's angry.

Trivia

 * Its name Cattus is a combination of "cat" and "cactus".
 * Unlike most cats, Cattus only eats rattan wood as revealed in BoBoiBoy Leaf VS The Pirates.
 * Cattus is a herbivore (as it eats rattan) and doesn't even know what a rat is.
 * In Phantom Thief Panto, Koko Ci reveals Cattus' gender to be male.
 * Cattus has a cushion plushie along with BoBoiBoy, Yaya, and Ochobot
 * According to a video uploaded by Monsta, there are 6 moments of angry Cattus during the series.