can anyone tell me some good feats for a general biped eidolon?
You should ask this in the Advice forum, the Rules forum is for questions on how the rules work/game mechanics.
I agree, should be in a different location, hopefully a mod will notice this.
The only feats I can think of would suit every Eidolon which are Toughness, improve natural armour, improve natural attack. What are the current states for the biped? Is it large or medium size? Can also do what I do and have the biped act like a humanoid to fit into society, pretending to be human.
It very much depends on what you want the eidolon to focus on. Lots of people give their bipeds weapons, which would make Martial Weapon Training (or Exotic) a good choice. But others just go with natural attacks, which would make it a waste of a feat.