Ruruka is a cunning young woman who is described to have a mean streak despite her cute appearance. She appears rather manipulative and is not above using her friends to achieve her goals. She can be extremely selfish as well, as during the Final Killing Game, she focuses only on keeping herself alive.

While she can appear easily annoyed and even mean towards others, Ruruka acts very sweet and intimate with her romantic partner Sonosuke, and she often feeds him her candy. Her candy can brainwas