Due to circumstances beyond his control, Rika was raised as a test subject within a research facility. From the bits of information he’s gathered over time, it seems his mother was very poor, and as a way to earn enough money to provide for her unborn child, she signed herself and the child up for a clinical trial. The mother died in childbirth, and Rika, with no known relatives, was left under the care of the researchers. The goal of their trial was to determine if it was possible to grant magical abilities to someone who wasn’t born with any.

Raised within the confines of the research facility, Rika was subjected daily to experiments, screenings, and the like. As they couldn’t attend public school for obvious reasons, they were homeschooled by the researchers. They did, however, have access to various forms of media, offering glimpses of the outside world. They were also allowed to set foot outside the facility from time to time as long as one of the researchers was accompanying them, in order to prepare them for the hopefully normal life they would eventually lead.

Although Rika was successfully imbued with magical powers early on, they came with their fair share of side effects. They manifested in unpredictable ways and she was unable to gain control over them, leading the researchers to label this artificial magic ‘chaos magic’. The project was eventually deemed a failure and shut down, and Rika was sent on her way with a customized medication that, if taken daily, could suppress her magic, granting her the ability to activate it at will instead of it occurring randomly. Initially, the government supported her by offering the medication free of charge. However, after a few years, this support ceased, and she now has to shoulder the cost herself.

When given the option to reside in Central City upon his release from the research facility, Rika rejected the offer. Influenced by his distrust of upper-class individuals, reminiscent of the researchers who monitored him, he chose to live on Island 6, where they could no longer keep a close eye on him. His only interaction with them occurs whenever he has to obtain his medication, and he actively avoids the heavily surveillant Central City due to a lingering fear of being captured and forced into another experimental trial, now that some time has passed since his release.

The ability to sustain their medication supply was part of the reason why they began participating in underground fighting rings. Winning fights against contestants is not only their way of making money, it also provides them with the opportunity to let out their anger and freely experiment with their chaotic magic—after all, anything goes during these fights.

Rika prefers to forcefully keep her distance from other people to minimize the risk of potentially endangering them due to her abilities. She constantly antagonizes others for nonsensical reasons in hopes that she’ll be avoided entirely—sometimes these arguments end in brawls, which suits her just fine. Her closest companion is Jack, her dog, a chow-chow that seems to be unaffected by any form of magic.