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A supporting character in the series Sword Art Online. He's the first character that the protagonist, Kirito, meets in the fictional Virtual Reality Massively Multiplayer Online Role Playing Game (VRMMORPG) Sword Art Online at the start of the series.
- Name: Klein
- Normal Gender: Male
- Apparent Age: Adult (Young)
- Avatar's Race: Human
- Ear Type: Human
- Eye Color: Brown
- Hair Color: Brown
- Hair Length: Short
- Hair Style: Spiky
- Facial Hair: Stubble/Whiskers
- Most Common Outfit Colors: Red, Gold, Black, and White
- Additional Features: Bandana
- Weapon: Katana (Sword)
- Note: His avatar and real life appearance are the same.
Later in the series he uses an avatar with a few changes in appearance:
- Name: Klein
- Normal Gender: Male
- Apparent Age: Adult (Young)
- Avatar's Race: "Salamander"
- Ear Type: Human
- Eye Color: Red
- Hair Color: Red
- Hair Length: Short
- Hair Style: Spiky
- Facial Hair: Stubble/Whiskers
- Most Common Outfit Colors: Red, Gold, and Black
- Most Common Outfit: Flame Patterned Robe
- Additional Features: Bandana, Translucence Wings
- Weapon: Katana (Sword)