Who does bumbper Robinson play in transformers animated?

You're likely thinking of Bumblebee, not "Bumper" Robinson.

Bumblebee is a main character in Transformers Animated. He is a young, energetic Autobot scout who is often the first to arrive at a scene and is eager to jump into action. He is also a close friend of Sari Sumdac, a human girl who helps the Autobots on their missions.

There isn't a character named "Bumper" Robinson in Transformers Animated.