So I don't know if the idea has been tossed around but... psionics?
Are you serious?!
Anyways, my initial build looks like it'll be a level 16 build, 36 point-buy, requiring 15 mutation points (from d20 Future/Apocalypse). 3 levels of the Tough Hero base class, a level of Evolutionary (from d20 Apocalypse) to increase his base claw damage to 2d6, two levels of Martial Artist, and then 10 levels of Thrasher (from Urban Arcana) for DR 10 and some ability surge(like Barbarian Rage), etc... I'll probably need to borrow a few things from D&D such as templates or feats or something because nothing in the d20 Modern RAW can replicate his healing factor, but aside from that I think I can get a pretty accurate build.
Wolverine, as built by RAW with d20 ModernAside from adding the Feral template and Healer template (d20 Future) to this, are there any other small things like feats that would add to his fast healing ability or give him regeneration?