There is the last CL4P-TP unit, ClapTrap. The last of his kind, and easily the funniest character ever. Oh, did I say funny? I meant annoying. And funny. Then there is Ghost, the timid insecure manifestation of the Traveler's dying light. He's also annoying... But at least he doesn't make ridiculous humor every other sentence. And finally Cortana, the Smart AI, and all you Halo fanboys out there are clicking on that for her boobs. You know you are. And that's it! Let's see which game pulls off the robot sidekick better. Personally... I like ClapTrap. Long live the New Robot Revolution!!! EDIT: Cortana IS a robot, so stop saying she isn't. Cortana isn't just some mystical blue haze, she's a programmed personality capable of performing complex tasks. An artificial intelligence. Either on Chief's spartan suit, or the program is broadcasted from miles away from a server in a room, Cortana has a physical embodiment. For those of you who don't know, a robot doesn't have to be a machine that moves about on its own, its a machine that is "capable of performing complex tasks" much like the computer your sitting at right now. Cortana is a box with extreme hardware and some fancy lights that project a hologram that is the shape we know as Cortana. She's a robot.