Plaza, who plays April, told The AV Club that she was given a lot more to do in the show's second season.
"In the first season, I did have a smaller role to play," she said. "In the second season, I had this relationship that was kind of a motivation for April, so I think once that came into the picture, I found I had something I was fighting for, something I really cared about."
She continued: "Up until then, [April] really just didn't want to be there, so the comedy came out of that. But once you give her a goal, there are different choices and different things that come out of her. That was really important to me. It was really good for me to do that, because I think - I hope she's not rolling her eyes in every scene. There's more to her than that."
Plaza also described the pairing of April and Andy (Chris Pratt) as "really cool".
"I think April kind of represents a generation, in a way," she said. "She represents this young force in the office. At first glance, you kind of write her off as this disaffected young person that is over it and doesn't care about anything.
"But with the Andy stuff, it shows you - I don't know. Maybe the message there is [that] there's still something to be said about being positive and being around people that are just optimistic about life in general. That's something young people need, or want secretly."
Parks And Recreation is expected to return in midseason on NBC.