Juliet, real name Kurosaki Juri (黒崎樹里), is a Master from the Kingdom of Altar. She is currently ranked 4th in the Kingdom's duel rankings.Juliet's avatar appears as a young woman of average height with silver hair and red eyes who wears Gothic clothing.

In reality, she appears as a female Japanese middle school student.Juliet tends to behave in a highly theatrical manner, typical of those who suffer from chuunibyou. Her speech style is also very chuunibyou, which confuses most people, even Rook Holmes with Ray Starling being a rare exception. She is, however, a very kind and empathetic person, who is willing to lend a helping hand to her friends and other beings in trouble.Juliet first logged in Infinite Dendrogram in order to dress up and express herself in a way she couldn't bring herself to IRL. Soon after her Embryo had hatched, she took to the sky to take a selfie and suffered her first death penalty from a bird monster.

At some point Juliet become a duel ranker and rose to the position of 4th. During a disagreement with Manjushage Shion, she was robbed of a rare sword she won at an auction and destroyed Shion's clan, Dark Ball's base in retaliation.