Boomer as Phineas.

Butch as Ferb.

Blossom as Candace. ( both have orange hair)

Bubbles as Isabella.

The Mayor as Major Monogram.

Talking Dog as Perry.

Mojo Jojo as Dr Doofenshmirtz.

Buttercup as Vanessa.(because the are both serious)

Mitch Mitchellson as Buford

Brick as Jeremy.

Little Arturo as Baljeet.

Robin as Stacy.

Mrs Keane as Linda.

Professor Utonium as Lawrence Fletcher

Sedusa as Professor Poofenplotz.

HIM as Doofenshmirtz (2nd Dimension)

Princess Morbucks as Suzy.