Wyll.
I like him. He announces his presence at the gate then when your inside the grove you see his heart. I can see your point.

I like his classic hero mold.
His edges are his theatrics so I class him into Bard.

What makes him a power is the power of hell compels him and finding a way to be the hero. He's not meant for everyone but he is compelling in the position he finds himself. In my mind the premise is better than execution but the execution is good.

Seemingly early on, he was chaotic edgy and was rewritten to more Lawful which comes across as neutral, which in the story translates to safe and bland sometimes.