Okay but at the start of the show, she:
1. Lives with her dad, despite being in her 20s.
2. Only has a part time job as a barista
3. Is maybe going to night classes or something to become a journalist?
4. Doesn't have much of a personality to speak of
I'm not even sure she's a "good person". What does she do that indicates she is? I'm not saying she's a bad person, she's just kind of, there.
I will give that she is smoking hot.
What does living at home or working part time in her 20's have to do with her being a good person or not? Lots of people, good and bad, are in that exact situation.
Seriously. She works a part time job, is getting an education and lives at home in her 20s. If that excludes her from being a good person, then there are tens of millions of people worldwide are just bad as Iris.
As far as her personality goes, if we're assuming she actually lives and breathes a life outside of what we see on the TV screen she could have lots going for her. Other than the thing with Linda and Barry she hasn't done anything malicious or hurtful to people.