Midna, but I also liked the king of red lions. I thought Fi would be interesting before SS was released but she disappointed me, she lacked depth.
I finished TMC and I wish I could rip that stupid hat off and duck tape Ezlo. He was funny at times but besides the ability to shrink and to use him as a balloon for a short time he wasn't that helpful.
Anyone who didn't say Zelda has no right to call themselves a Zelda fan Lol