Gallery:Phineas Flynn/Season 3

"So, Ferb, what should we do tomorrow? There's a world of possibilities. Maybe we should make a list!"

- Phineas to his stepbrother.

"I know what we're gonna do today!"

- Phineas' catchphrase.

Phineas Flynn, also known as Dinner Bell by Buford, is a boy in the Flynn-Fletcher family. He is the son of Linda Flynn and stepson of Lawrence Fletcher. His sister is Candace, and his stepbrother is Ferb. He is friends with Buford, Baljeet, and Isabella, who has a strong crush on him (if he returns it is so far unknown). He has a strong bond with Perry, their pet platypus, and he always wonders where he is.

An incurable optimist, Phineas constantly looks on the brighter side of things. He is as well extremely smart, creative, and persistent, causing him to build immensely large inventions and activities with the help of his stepbrother. His hospitality often affects his plans.