So basically, GM is just a big fella pretending to be guy. In his false form, he's a little taller than Guy (6'7), his maximum speed is 10 mph, and the maximum amount of weight he can carry is 175 lbs, in his true form, he's HUGE (10'3), his maximum speed is 34 mph, the maximum amount of weight he can carry is 1,947 lbs (It's incredible, ain't it?), his skin is very hard to penetrate, and he can barely feel pain, and he can just run towards a wall made out of every hard material in existence, and break through it. Of course, with great power, comes great weaknesses, he is afraid of making eye contact, and the only way of penetrating his skin is letting him smash through things, until he begins to bleed. It is impossible to outrun GM, but you can slow down GM by playing any loud, and high pitched audio, he has sensitive ears. GM was based off of MX/Mario '85, who is owned by RazzDazzleDoo.
