[@Yam I Am]

The first thing I'm planing on changing is Rolf. Instead of being a regular hawk he is going to be a demon hawk sent by some evil demon possibly even Lord Ahriman to seduce her more fully to the dark side.

Because! And I think this is great! She's not fully evil yet. She's just done. She was raised by a family that was pledged to Saint Zariah. Anything for the Greater Good and all that rot. So, she's been training in combat and tactics all her life when one day this little wannabe hero from nowhere shows up without the faintest clue which end of the sword to hold. And rather then being allowed to fight the evil she's been training to fight her whole life she's told it's her job to help the Hero kill the evil. And so she does it the first time. And then the second. And by the third Katrina is a little miffed. She's been training her whole life. Beaten black and blue for every little failure. Force to help clueless nobodies who's only claims to fame are Blessings from Saint Zaria. When is it her turn to shine? To show off? To conquer? To win? So, she says damn the Heros and damn Saint Zariah and leaves.

I was planing, at the start of the story, not have her be quite evil yet. She's not really on the Good side, but she's not really Evil. Then as the story progresses, with Rolf whispering in her ear, and watching others who are Evil have a grand old time start wonder why she shouldn't be Evil. After all, if she can't be the main character, Katrina might as well have the time of her life.

Character regression arc! Let's go!

PS. I'm not sure what you meant by obvious. I'm sorry.