Tama

Gatta is a cat and also a stand user hybrid shown in Part IV: Diamond is Unbreakable as an antagonist.

Personality
Gatta is stubborn, sticking to its territory in the cellar when Shinobu Kawajiri attempts to chase it out. After it is killed, it shows a desire for revenge, and attacks Shinobu when it sees her in the garden. It is friendly to Yoshikage Kira until Kira himself deems the newly resurrected Stray Cat a threat. However, it is able to easily forgive Kira, and allies itself with him. Stray Cat is shown to get along well with Okuyasu's father after Kira's death.

Diamond is Unbreakable
Gatta was once a normal cat that was hit with an Arrow. It takes refuge in the cellar of the Kawajiri household where it is killed by a broken glass bottle when Shinobu Kawajiri tries to chase it out. After being buried in their garden, its dormant stand ability brings it back to life as a cat-like plant named Stray Cat.