Phineas Flynn (voiced by Vincent Martella) is a young boy from Danville and one of the main protagonists in The FT Squad's Adventures With Phineas and Ferb. He and his stepbrother Ferb, on summer vacation, spend it by creating inventions that are seemingly impossible to make, and yet they entertain Phineas and Ferb's friends. But these get on the nerves of Candace Flynn, their sister, who tries to expose them to their mother to get them in trouble. Phineas doesn't do his daily activities to get himself in trouble. He does it for fun, or to help someone, whether its a friend or a family member.
- Phineas will star in The FT Squad's Adventures With Phineas and Ferb, where his penpal Kyle the Otter, and his friends Rudy the Alligator, Dennis the Frog, Cassidy the Pelican, Kimmy the Elephant, Kaytlin the Otter, Wubbzy, Daizy, Widget, Walden, Simba, Nala, Timon and Pumbaa, come to Danville to spend the summer.
- Phineas will guest star in The FT Squad Rides on the Magic School Bus, The FT Squad Goes to Jurassic Park and The FT Squad Goes to Monsters Inc.
- Phineas has many friends in Danville, but one special friend is Isabella Garcia Shapiro, who has a secret crush on him.
- Phineas will meet Tino, Ash, Timmy Turner, Barney and their Friends in Tino's Adventures of Phineas and Ferb.
- Phineas has another special friend named Kyle Larman, who's new to Danville and very shy. Phineas treats Kyle very nicely and he often invites Kyle to his house if he wants to help him be more confident and courageous, or if Kyle's cousins are too busy. Phineas cares deeply for Kyle and sometimes treats him like another brother, something Kyle finds sweet and encouraging to his confidence.
- Phineas and Ferb will join the team in Doraemon's Adventures of Mickey, Donald and Goofy in The Three Musketeers.
- Phineas will make his first debut Doraemon's Adventures of Batman.