the creator cant be sued for copyright unless he's gaining profit from it.
wouldnt this be like a fan game to the general Giant Fighting Robot genre? Fan games havent gartered that much heat from copyright suits in the past. Unless YSK wanted to eventually port this game for profit, I dont really see a problem.
but that's just knowledge based on what I know about copyright infringement
Heres an idea for another Mech
based on Metal Wolf (aka Michael Wilson) from Metal Wolf Chaos. see here http://www.1up.com/do/feature?cId=3168548
Note: Metal Wolf carries weapons in the pods on his back, so he can change between a gatling gun and oversized rocket launcher without questions
Primary weapon: Gatling gun
Fires multiple rounds. slower Rate of fire than machine gun, but more powerful
Secondary weapon: Missile Punch*
Grabs a missile, then slams it into the enemy's face.
Special 1: Grenade launcher
Fires a grenade-like shot that explodes, knocking target away. Like regular grenade, but shot as a bullet instead of thrown
Special 2: Cross shaped Missile launcher
Fires a swarm of missiles from this special gun. like the missile launcher on the original Windom
Special 3: RRRIIICCCHHHAAARRRDDD!!!**
The pods on Metal wolf's back open up, revealing all his weapons, and fires them all at once.
*If you know what i'm talking, about you know just how awesome it is.
**that totally should be the sound effect for this move.