Tim

Tim was a Cat that resided within the village of Ulthar. He was the pet of Mina and was elected as the first King of Cats.

Tim apparently was fond of Mina, as he allowed her to pet him and sat near her on the window sill. He display hostility toward her husband, Matthew. He's also displays intelligence and anger, as shown when he killed Matthew.

(Source: The Ancient Magus Bride Wiki)