Scratch

I've never made an AI before (it's next on the list), so I can just give you some small inputs.

This seems like a single-screen platformer. Makes things easier. I would start by giving the AI equal (or inferior) chances than the player: duplicate the player's movement scripts, but trigger them with a broadcast rather than an arrow key.

Then, to the actual intelligence of the AI. For movement, try sensing where the player is relative to the AI (left-er or right-er) and broadcast that movement. For the jumping, maybe have preset jump points or something.

I don't really think that helped much 

You should make sensors to detect if the Player is in front of the AI, and if it is, shoot. And follow, but if it can't see the Player anymore, it'll just go around "randomly" until it finds the Player again.

okay, first, if the player is to your left, make his x velocity change negativly... if he's to the right, use positive. if he is above you, make him jump, and say that if the distance to the player is less than somthing, broadcast "punch" or "kick". if you think, it's pretty easy... it just takes a little bit...