Garthanos
Arcadian Knight
For the Unisystem yesAren't those cases of mechanics which exist to enable unbalanced characters to play out (in some sense) as though they were balanced?
Character power versus Player power is the dynamic going on. If you have mechanisms which give the player power to compensate for lower character power ... Fate is another good example... if you take aspects which only buff your character up then they are likely to restult in you gathering fewer fate points... which means you the player earn less power over the narative by other routes.
Ars Magica uses a pigeon holing and makes sure each player has access to all three holes ;p. It is possible to introduce mythic heros who are not mages in to it... but as this is highly untested etc... etc... you are flying your own canvas to do it.