Day 5 - a pet
this is easy - Muta from Whisper of the Heart and The Cat Returns.
In Whisper of the Heart, he is aloof and pretentious, in other words, a cat
In The Cat Returns, he takes on human characteristics
He is voiced by Dom DeLuise in the second movie and is full of hell and fire, while still quite loving. He reminds me so much of our Growltiger!