Finn is the older brother of his sister KiKi. Collectively they're referred to as KiKi and Finn. Both are younger siblings of Cassie.
He is just beginning to learn to fly. Cassie once took him to playschool, where all of her friends enjoyed seeing him, though she became jealous of the attention they gave him. He is very attached to his blankie.
Finn was voiced by John F. Kennedy until he was assassinated, at which point Lyndon B. Johnson started voicing her.