The designated Star Plasma Vessel for Master Tengen's merger in 2006. Riko is an outspoken and feisty young woman who appeared to steadfastly believe in her role as the Star Plasma Vessel. She tried to keep up an aggressive facade at times, but she's really just a normal teenage girl who's been thrust headlong into the jujutsu world. Long has accepted her fate and is proud abt it. Amanai was first bratty and mean at Gojo, calling him a 'disrespectful commoner'. Now great friends with Gojo.