What cartoon is about a guy who turns into a cat? - briefly
The cartoon you're referring to is "CatDog," which features a two-headed character where one head is a cat and the other is a dog.
What cartoon is about a guy who turns into a cat? - in detail
The animated series that features a man turning into a cat is called "Kaibutsu-kun" (also known as "Monster Kid"). This Japanese anime, based on the manga of the same name by Fujio Akatsuka, follows the adventures of Kaibutsu-kun, a young man who has the unique ability to transform into various creatures, including a cat. The series explores themes of friendship, love, and the challenges of growing up, all while incorporating elements of humor and supernatural events. "Kaibutsu-kun" is known for its vivid animation style and engaging storylines that cater to both children and adult audiences alike.