|Anime debut||Yu-Gi-Oh! VRAINS episode 52: "Tapping Out"|
|English||Ashley Eileen Bucknam|
Kiku is a petite young girl with fair skin, hazel eyes, and navy blue hair tied back in a plait. She wears a basic sailor-style girl's school uniform. She retains her normal appearance while she is logged into LINK VRAINS.
Kiku is shown to be incredibly concerned for Theodore's well-being, constantly urging him to come to school instead of skipping. She noted that she was pleased to see him acting livelier before he transferred to Den City High School.
Kiku was a friend of Theodore Hamilton. She tracked him down to chide him for continually skipping school, but Theodore claimed he never saw a point in it. After another fruitless attempt, they were walking through the market area when they saw Ridley and Taz's gang harassing another boy, and Theodore scared them away. The boy tried to thank them, but Theodore left without a word, and Kiku apologized to the boy, admitting that Theodore wasn't too friendly. Theodore then claimed to have heard a voice, though Kiku didn't hear anything. The next day, he asked to use her tablet, and they read about Playmaker, Blue Angel and The Gore, the heroes of LINK VRAINS. As Kiku got a call from Hana, Theodore had a trauma attacked and nearly dropped Kiku's tablet, much to her fear given its cost. Kiku was later kidnapped by Ridley and Taz, and the delinquents took her cellphone and told Hana to fetch Theodore. Theodore eventually showed up with his Duel Disk, and despite her pleas not to let Ridley provoke him, he accepted Ridley's challenge to Duel and told Kiku to leave and meet up with Hana.
Later, Kiku asked at the fish stall where Theodore was, and she found him at the harbor reading the articles on the heroes of LINK VRAINS again. She asked him if he was going to come to school again, but Theodore informed her he was leaving the city to pursue his own fate and asked that she look after his grandparents while he was gone. Kiku agreed, and she commented that Theodore seemed much more full of life than usual.
Theodore eventually returned home, and three months after his return he took Kiku to LINK VRAINS, logging in as Soulburner with her. He showed Kiku around, impressing her, though Soulburner claimed that there was someone cooler than he was. Kiku wanted to meet him, but Soulburner explained that person was on a journey to find himself.