He's a hard one to even pin down.
In the books, he's not much more than a very charismatic person who could see the future, and basically the events that could effectively change it. Supposedly he can be in many places at once, bridging space and time... or something.
But remember he basically got the full training of a Bene Gesserit, which accounts for his monk like speed, agility, and fighting style. This is also where the got the "voice", and some other nifty powers.
So maybe a Monk with a theme that grants prescience? and some nifty self healing powers?
Note: Might make him a Deva Monk. The whole other memory bits.