Tsuboi Ryoutarou (壷井遼太郎, Tsuboi Ryōtarō?), known as Klein (クライン, Kurain?) in «Sword Art Online» (SAO), «ALfheim Online» (ALO) and «Project Alicization», is a supporting character in the Aincrad Arc and a reoccurring character through the Sword Art Online series.
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