ریوتارو تسیوبوی

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 so he couldn't leave them. He survives for the past two years and managed to protect his friends the whole time, something Kirito regretted not doing. He is a katana user and the leader of the small guild Fuurinkazan who participates in the boss battles.

As one of the few people close to Kirito, he always keeps him in check and wants Kirito to survive the game.

He chose the Salamader race in Alfheim Online.

[Spoiler: In the side story Caliber, he fell in love at first sight with the girl on the cage named Freyja and agreed that he will help her find her tribe's treasure which is a hammer, though the decision still remains to be a team's decision.

The team said yes on Caliber and it turned out that the girl they saved was Thor. It was revealed that Thor disguised as a beautiful girl to get close to Giant King Þrym and retrieve his hammer. Thor defeated Giant King Þrym and that stopped the medallion from being corrupted and ending the quest.]