Japanese name:	壷井遼太郎
Nickname:	Klein

Klein is a friendly player that meets Kirito at the start of the game and quickly befriends and learns from him. He and Kirito later separate because he has friends who were also new to the game, and since he was taught by Kirito who was an experienced player, he couldn't leave them. He uses a katana to fight and leads a party. Klein reunited with Kirito after two years when they run from a monster and start having lunch. He regularly meets with Kirito and his friends and occasionally go with them in quests in ALO, especially after the release of the World Seed.

Voiced by: Hiroaki Hirata

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