Isabella has somewhat long hair with a usually 2-pointed bow in her hair. In "Where's Perry: Pt. 1," there were 3 points in her bow by mistake on the airplane. She wears a pink dress when not on duty as a Fireside Girl. As a Fireside Girl, she wears an orange and brown shirt with a sash around her.
Isabella comes over to Phineas's house almost every day and says, "Whatcha doin'?" In the movie, Phineas and Ferb Across the 2nd Dimension, she also kisses Phineas, which he will never remember, because at the same time, they were getting rid of their memory of Agent P.
Croconaw is her pokemon because he almost actually talk like a human but unfortunately, Boidoh came to her house and Kill Croconaw