Credit: Bob D'Amico/ABC

With all narrative upheaval on Grey's Anatomy, at least one thing is certain: the April Kepner we met in Season 6 is not the one we're seeing now in Season 10.

In an exclusive interview with Wetpaint Entertainment, Sarah Drew reflects on her onscreen counterpart's evolution.

"I think that my character has grown and blossomed," Sarah tells us. "I think she started on Season 6 as sort of being a bit grating; really, cripplingly insecure; and kinda passive-aggressive … not a very attractive character, in terms of her personality.”

But that was before all the zigs and zags April's personal and professional life has taken in the intervening three-plus seasons — her serving as Chief Resident, her taking the boards (twice), her losing her virginity to Jackson, her embracing and proclaiming her faith, etc. — and Sarah believes those experiences brought April's confidence and assertiveness.

"We've seen her go from a place of hiding behind the shell that she was [using to try to] protect herself from everybody else," Sarah says, "to then coming into her own and being like, 'You know what? This is who I am. I'm not going to hide anymore. Yes, I can be obnoxious sometimes and frustrating to be around. And yes, I just say whatever happens, and I spin out of control, and I say what I think without editing myself ever. I put my foot in my mouth all the time. But that's who I am, and if you don't love it, that's fine because I love it.'"

Gradually, as Sarah observes, April's colleagues have boarded the Kepner train — or gotten left behind: "When she became Chief Resident, she struggled a lot with, 'Are they gonna follow me? They don't like me. Nobody likes me here.' … Now, she's like, 'OK, you don't like me, you don't like me. That's fine. But I am who I am.' But I find that whether you like who she is or not, there's something wonderfully attractive about standing on your own two feet and declaring who you are and being comfortable in your own skin — and I think that has enabled her to blossom. And I love that about her. That's one of my favorite things about April."

Ours, too!

Do you think April is the Grey's character who has undergone the most change? Or someone else? Let us know in the comments below.

Dan Clarendon is an assistant editor at Wetpaint Entertainment. Follow him on Twitter and Google+!