Megatron since I have no interest or desire to become a Whoovian Bumblebee G1 vs Bumblebee (Transformers Prime version)
Dashie. Starfire wouldn't be able to bring herself to attack a pony. Unstoppable force vs immovable object.
Immovable object. It forced the unstoppable force to turn. Grim(from grim advebtures of billy and Mandy) versus the grim reaper in conker's bad fur day
Veruca salt... She'd make diamond tiara her pet... the badger song verses the "song that gets on everybody's nerves"
Leonardo DiCaprio Sheva or Ashley in a worst Partner Competition (Ashley is from RE4 and Sheva is from RE5)
That's a tough one but i'd proabably good with Harley Sinestro vs. Brainiac in a supervillain fight to the death.