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11 Klein is a returning Sword Art Online character who appears in Echoes of Aincrad as a sword user. He is one of the characters the player can take on quests as a partner. This page covers him only as he appears in this game.
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44 At a Glance
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66 FieldDetailWeapon typeSword (see One-Handed Sword)English voiceKirk ThorntonPartnerListed on the partner roster on NPC Companions
77 Official Profile
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99 The official profile describes Klein as a compassionate swordsman who has partied up with some old friends, and says that a strange twist of fate brings him and the protagonist together. His line on the official roster is a cheerful remark about catching the scent of adventure and treasure.
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1111 Role in the Game
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1313 Klein is listed on the partner roster covered on the NPC Companions page, which is where to check when he becomes available. He is one of three sword users on the official character roster, alongside Iori and Kirito, so the practical differences between them come from their partner skills rather than their weapon. Those skills are listed on the Combination Skills and Support Skills page.
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15+His Support Skill is Bolstering Bellow, which grants temporary invincibility along with attack and defence. The Ver. 1.0.6 update on September 25, 2026 adjusted its activation conditions and invincibility time.
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1517 Related Pages
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1719 NPC Companions: the full partner roster and how partners join.Combination Skills and Support Skills: every partner's two abilities.Iori and Kirito: the other sword users on the official roster.One-Handed Sword: the sword weapon type.