Rika Makiba is a petite brown haired girl, one year younger that the other characters. She is also the smallest character with a height of 149cm (the second one is Kanae Hokari with a height of 153cm). She is often wearing her school uniform, which consists of a traditional sailor uniform with black knee-high socks. She also has a small bow in her hair and her uniform's ribbon is red instead of green, because she is a junior.
Somewhat spoiled, a cry-baby, and sociable, she’s viewed as something like a mascot and beloved by her fellow classmates. She has a personality of an innocent girl with the heart and soul of a younger child which makes her the most vulnerable victim of the Game. While normally bright and enthusiastic, her cheerful demeanor is easily spoiled as she is often the target of teasing and mockery by Nemu. Her overemotional nature, prone to tantrums and tears, will give her the most difficulty in adjusting to the cruel and twisted trials of the game. She looks also easy to manipulate, a trait that both Rinne and Nemu will use at their profit. Keisuke manage to make her think that she is nothing but a dog, literally. She also greatly fears to be left alone and she is very impressionable.