Our titular heroine. BEA-Droid Alpha. Beatrice 'Bea' Galata Flynn. Phineas and Isabella's robotic daughter.
- Big Sister Instinct: Will stop at nothing to protect her siblings, man, or machine.
- Pinocchio Syndrome: Has a rather nasty case of this, deeply insecure about being a robot and wants to be Human... at first. But after an adventure involving Phineas and Ferb's Molecular Separator, she got to rethink this.
- Wonderful Werewolf: In one chapter she's mauled by a dire wolf, and contracts lycanthropy. However, thanks to her father and step-uncle. She can freely turn into a Werewolf or wolf form.
- Zettai Ryouiki: Grade C, has socks that go up to her knees