I'd do nothing. Not because I'm scared of hitting some ******* in the face or because I'm just shy to tell the bully to leave the guy alone, but because people nowdays are pussies. They complain about having enemies in life. If you grow up with no enemies you'll think you'll never have enemies and trust me there'll be always a **** ****ing your life.
Also bullying is a very democratic way of fun, where everyone has fun and only one guy gets screwed. If we were to protect the victim no one would have fun.
The only people who get bullied are the ones who want. If you don't like being bullied hit the ****ing bastard in the god damn face and break his ****ing nose.
I can tell this from experience - I've been bullied and I've been the bully
The trick is just to punch the ******* in the face.
Get a higher self steem and deal with it.