In the campaigns, does he function as an antagonist, patron, quest giver, or variable?

I usually play as him, so he's a protagonist. I might be making him an information broker for the next game.

Oooooh!
Can you tell me about his adventures?
Has he acted differently each time?
Looking back, can you see changes in the way you play him now versus before?

He didn't have much ADVENTURES in the common sense. Most times these were games inside the city walls, some detective-like things. Now when I think about it, it followed the scenario of someone doing something unlawful, and everybody pointing at him (because racism!), and Lim having a need to help out and clean his name. Huh. I guess, the DMs never could imagine him involved in something in any other scenario. These things varied from coercion and robbing of a trading company, to murders of innocent maidens.

He did, of course, change over time. You always start with this rough, like a raw stone, and in time the edges smoothen. He was originally far more sexist than he ended up to be - nowadays, he hardly distinguishes the sexes, for example. Much more daring, so to say. When he sees no potential in talking his way out of something, he prefers to draw the knife first, instead of weaseling out. I guess, that means, he gained more wisdom. Also became more open to what he does, allowing people to rumour around, which is both dangerous and profitable.

At the moment, he's involved in a little different, pirate-ish, module, but for the fear of spoilers, I'd prefer not to uncover the real deal behind it.

This is fascinating...!
What an excellent character!
Thank you so much for telling me about him, I absolutely adore him!