[@Rae Zer] Ah, there seems to be a misunderstanding.

Its similar to Fate in the aspect a heroic being is summoned from the past. However, there are no 'Masters' or 'Command Seals'. In short, said Offscouring and Drifters are of complete free will. In the case of Offscourings, they will be led by a certain individual as a plot device but are mainly allowed to act on their own accord. There are no classes, no additional stats and whatnot. Your character will be as his base self. Magic will work as per the original rules of its context; for example if your character is a Voodoo user, then he/she can use it as it originally worked from wherever he/she was summoned from. I do however like the idea of having an equivalent of a Noble Phantasm.