plasmid303
Super Freak
i believe they all have one to some extent. the mark III seems to have a rubber casing under the plastic "armor," and under that is probably some type of true type, or specialized figure body...
The Mark II and III have an articulated structure underneath similar to what HT uses for their Robocop figure and to a further extent the AVP/ALIENS figures. It is not a True Type. Not that it really matters.
The Mark I has an actual True Type body underneath because you can see between the interconnected structures on the Mark I to see Tony's body, which can't be said for the MK II and III.