This.Later. Definitely. I really disliked Groose initially because he was a bully to Link, and I always take Link's side. XD
I didn't realize that Groose would eventually become more than just that. He really had a change of heart (or showed his true colors, depending on how you want to interpret it) after he witnessed Link's selflessness when he faced The Imprisoned. He went from a self-centered jerk who only cared for himself to someone who earnestly wanted to do better for the world. He became a really likable character in the end. He really wanted Zelda in the beginning, but during some of the last cutscenes in the game, his maturity shows when he accepts the fact that she probably is better off with Link.