Bulkhead

Bulkhead is one of the main protagonists of the Sonic the Hedgehog Transformers Prime. He's an Autobot warrior, former member of the Wreckers, best friends of Wheeljack, Seaspray, and Miko, and a member of Team Prime. He also became best friends with Knuckles the Echidna. He has a rivalry with Breakdown.

Bio
Bulkhead looks huge and menacing, but is actually quite careless and gentle-souled. Though he's neither a brainiac nor a fast runner, Bulkhead is one of the most sturdy members of Team Prime. He's afraid of hurting things smaller and more fragile than him, but his new human friend, Miko Nakadai, has helped him grow past that. He has a low tolerance for jerks and bullies, and is quite happy to let people like that stew in the trouble they've made for themselves, but his better impulses—or at least, needling from those around him—always sway him into helping in the end.

For all his sweetness, he's still a Wrecker through and through. Yet, despite participating in several major battles and campaigns, his past career has left some painful psychological scars. Being a part of the Autobots' black ops team means you have to do the dirty work, and Bulkhead's seen many horrors and friends meet a bad end. Though saddened by his traumatic experiences with the Wreckers, he's joined up with Optimus Prime to end the fight with Megatron, for the sake of all his brothers and comrades.