I think a case can be made for both ESTP and ENTP, based on the movie (just saw it last night)
The sheer building of the suit, the 'hardware' as he calls it, the flying and manoevring, the exuberant Expo he made, his driving everyone around him crazy coz he cannot be controlled, is kinda...STP, I'd say.
The conception of the suit, the software that goes into it, the making a new element (also the way he gets to that point), the crazy ideas, etc scream ENTP
Both types do the womanizing thing and having a penchant for chaos. Both types take their time growing up and controlling their chaotic and destructive nature.
I haven't read the comic, but based on the vibe of the actor in the movie, I have to go with ENTP. Yes, he's a womanizer, however, he doesn't pull off the alpha vibe that ESTPs rock at. Charm and wit, yes...primal vibe when hitting on women...no.