A thief
A mage
A warrior
Each of them have special skills you would have for a long time.
Now what I'm asking you is which one would you choose?
All his skills except alchemy fit the thief archetype perfectly. Assassin is just someone who kills for profit; a mage or a warrior could be assassins. A thief only becomes an assassin once he takes some warrior or mage skills like one-handed or destruction. But you could easily roleplay (and I know people do this using arrows to distract enemies) a pacifist thief that only uses thief skills and never hurts anyone.