[So she's one of the people he's jealous of, which makes her giggle inappropriately considering the question he asks, but she just can't help it. She'd been jealous of him after all.]

A good person-- [Ahem. Let her think so she doesn't says "someone like you and not me".]

... A good person is someone who won't necessarily go out of their way for someone they don't even know, that's more selfless, but who has a kind heart regardless. Someone who looks out for the well-being of others. Especially those who need it, even if they might not be the best at caring for themselves.

But I think... most of all though, what makes a person "good" in my mind, is that they don't use or betray the trust others have put so carelessly into them. They don't take advantage of others or go back on their own beliefs.

[Maybe that one's a little broad. Murderers can have their own sense of morals or beliefs and won't go back on them, but it's just... something that's clearly dear to her, in essence.]

Something like that, I guess. Like you.