Katana

Persie’s “pet” cat, a stray she found wandering around. Persie thought he was a girl, and named him Catherine, but upon taking him to the vet she found out he was a boy, and decided to change his name to Katana.

 ...Very clever, there...

Katana is unusually intelligent, has shown the ability to recover small items, and apparently has a fashion sense. However, he occasionally confuses Helena for one of his toys and attacks her.

This is him IRL