Boris

Boris is a giant bully who wears big black boots. Therefore he is known as Big black boots Boris the bully. He used to constantly kick sand in Dr. Doofenshmirtz's face, even in places where one would not expect sand. When Boris moves to the tri-state area only blocks from Phineas and Ferb's house, Doofenshmirtz tries to get back at him with an as of yet unnamed contraption: a huge brown boot and a big bucket of sand.