Buford Van Stomm (2nd Dimension)

Buford is a kid in the Phineas and Ferb: Across the Second Dimension movie. Formally part of the Resistance, he rebels against the reign of Dr Heinz Doofenshmirtz.

History
In the past, he was part of the resistance, but when he got so good at what he does, he started resisting the other members in the fight against Doofenshmirtz.