He is a medium cat who wears a cowboy hat. His right eye is a red-and-white swirly while his left his blind until he was shocked by electricity. He is ordered by his owner,Pak Senin Koboi to guard his owner's alley for trespassers.
When Fang is about to pick up Yaya's Biscuits, he surprisingly appeared which scared him, BoBoiBoy and Gopal. Then he attacked the three, severely injuring them. But they managed to escape from the clutches of the Crazy Cat .
BoBoiBoy,Fang and Gopal planned to make the cat faint by feeding him with Yaya's Biscuits but he didn't, instead, he became a Helpful Cat after eating 3 of Yaya's Biscuits and got shock by BoBoiBoy's Lightning Shield.
- He is the third cat appeared in the series (Potato, Sasha).
- He is also the second cat that attacked Gopal, the first is Potato.
- He is also the second animal which scared BoBoiBoy, the first is The Wild Dogs (Episode 1).
- In the Malaysian version, he is known as "Kucing Sewel".
- The reason why he attacked BoBoiBoy, Fang and Gopal is because they are trespassing in the alley of his owner.
- To turn it into stable condition, it need 3 Yaya's Biscuits plus Lightning Shield.
- If Dzubir Mohammed Zakaria voices Crazy Cat, therefore, he also voiced Potato.
- It's unknown if the kitten that Yaya and Ying saw in the 8th episode of What Yaya Says is related to him