That and Caliber.
Klein really is Overshadowed By Awesome. He's an SAO noob who managed to hold his team together for 2 years, they're part of the clearing group, the top hundred players in the entire game, they've been at almost every boss fight,
and they have taken
ZERO casualties. In any other story, Klein would be the main.
Unfortunately, his friends are Kirito and Asuna. Isn't it said, Klein?