Ultima Online is all about freedom in an online world.
Where other games set you down on the same track thousands or millions have grinded through before, Ultima Online presents you with a malleable world and a massive list of skills and talents to use however you'd like.
You can build your character to be an evil chef who poisons cakes to kill other players. You can create a tradesman with one (or more) of many crafting skills and build your own shop outside of town. What about a dragon tamer? Or a dragon taming stealth wizard that happens to be an expert with polearms?
You can do whatever you like, you can leave your mark on the world, you can build your character in an infinite number of ways - and that's the point of the game.