Rolo from Code Geass R2 upgraded himself from being a rag to a likeable character.
He's the one one loyal to Lelouch after the whole Dark Knights turned on him. He trusted Lelouch as his brother and was content on having a brother like him (even though Lelouch never thought of him as one). I stopped watching Code geass after they killed him.
The way he died was too sad, even to my standards.