I could have sworn I asked for no special classes, of which Assasin most certainly is one of.

Samurai
Draw Out
Time Magic
Counter
Two-Swords
Move+3

This is your basic tank type, and he also requires high Faith. Give him a good offensive Draw Out and he can devestate enemies, plus he has some healing capacity, plus he can either boost your own party or mess up their party if they are too far away to be hit with the normal attacks. Even when attacked, he can be brutal.