Fial is not the passive type of pet, he loved to tease you or play tricks on you. Like a cat "enslaving" you.

Fial is not very faithful, or at least that's what he seems to be. He actually was one behind that Tsundere mask he showed. Sometimes he would bring you gifts when he went out into the forest, like dead rabbits or dead snakes..

You have a very romantic housemate, don't you?. He loved your compliments or pats on the head, but he also loved your reaction when he found a dead frog under your pillow.