A player in the fictional game Sword Art Online, in the series of the same name as the game. He is the founder and guild leader of the Knights of the Blood Oath (KoB) player guild.
- Name: Heathcliff
- Normal Gender: Male
- Apparent Age: Adult (Middle Age)
- Avatar's Race: Human
- Ear Type: Human
- Eye Color: Gray
- Hair Color: Gray
- Hair Length: Long
- Hair Style: Ponytail with single lock of hair hanging over the face on his left
- Most Common Outfit Colors: Red with White Trim
- Most Common Outfit: Suit of Armor (Knights of the Blood Oath Uniform with Reversed Color Scheme)
- Weapon(s): Cruciform (Cross-shaped) Sword and Cruciform Shield
He's later revealed to be the in-game avatar of Game Master Kayaba Akihiko.