Synopsis
Ryoutarou Tsuboi, known in-game as Klein, is one of the first people Kirito meets in Sword Art Online, a newcomer who asks the beta tester for basic pointers before the game turns deadly. Rather than abandoning his new acquaintance, Klein rejoins his real-life friends and forms the guild Fuurinkazan, which he leads through the front lines as one of the more capable clearing groups in Aincrad.
Easygoing, loud, and endlessly friendly, Klein is the kind of person who sets the mood of any room he enters and rarely holds a grudge. He is also fiercely loyal, dropping everything to help friends in danger and growing openly frustrated whenever Kirito throws himself into a fight without backup, a habit he never stops worrying about.
After Aincrad is cleared, Klein continues playing as a Salamander in ALfheim Online and remains one of Kirito's most dependable allies across the following arcs, always ready to grab a sword, real or virtual, for his friends.
