a. What initially prompted me to like the character enough to write about him/her

I "like" any neglected character enough to write about him/her; that neglect is frequently my prompt.

b. One of his/her best traits

He's good at his job.

c. One of his/her worst traits

He seems to lack curiosity; though that's probably self-preservation.

d. How easy/difficult I find it to write the character

That story wasn't difficult, because I was working towards a specific end/effect. I did question my impulse to have him speak in dialect; I tried to keep it non-specific, but I don't know if I did.

e. The story/chapter/paragraph/phrase where I feel that I truly captured the character

"So these are the things I can’t explain; I think it might be healthiest for me if I don’t try to. But this opera does crazy things to folks, and I can’t help but be grateful I wasn’t raised to it. Seems not one of ‘em can go about their life quiet-like, without any fuss, like I do. They can have it, I say. Least I’ve got my rats."

f. My plans (if any) to write the character in the near future

I don't have any; but I'll happily include him when/if it's appropriate!