He's also a typical stoic assassin with a very slim personality, very much like the first thing that comes to our minds when we think of the term, "assassin," without thinking of either Ezio, James Bond, or ninjas.
In fact, when you mentioned the little monkey, I was thinking, "Nintendo has to look at Assassin's Creed 4 for competition if they are going to make a 3D Donkey Kong game. The platforming in the entire AC franchise reminds me of monkeys all the time, and AC4 has sweet pirates, beautiful jungle environments, and underwater states even."
Why don't we get something like that in the series? My frigate username's a monkey-penguin hybrid that can't wear armor on and what got me interested in Assassin's Creed in the first place is the generic gameplay: how Assassins fought in those games is how my monguin should fight, with wits, swift tactics, and trickery charisma along with only a single little dagger as he's too small to even carry a short sword! Have you seen "Monkey Thieves?" That's Assassin's Creed in Real Life!