Requirements:

ItemDesc.
Camera View:3rd person
Characters:Jake, Kate, Tyson.
Environment:Earth-Suburban
Core Game MechanicRun, fight, shoot, jump, take cover, revive teammate.
AI:Optional AI for all the three characters so that players can play any of the three and the system handle the rest.
Physics:Collision, gravity, explosions, projectiles, etc..
Audio:Yes, our game is not complete with out it.
Networking:Upto 3 systems connected in LAN