The Beak is a parody of Iron Man using characters of Phineas and Ferb (with some exceptions)
Phineas - Tony Stark
The Beak - Iron Man
Ferb - Rhodey
Baljeet - Obadiah Stane
Isabella - Pepper Potts
Alfred (Batman) - Yinsen
Princess Luna (My Little Pony) - J.A.R.V.I.S
Carl Karl - Phill Colson
Chris Redfield (Resident Evil) - Nick Fury