Mikan Yuuki 結城美柑

Height: 149 cm

Rito Yuuki's independent and reliable 11-year-old sister, Mikan takes care of the housework while their parents are away on business.

In contrast to her brother, she is very mature and does not hesitate to tease him, going as far as stating they aren't blood related, just for a laugh. Mikan also seems to have a certain lack of respect for Rito because of this (she hardly ever addresses him by his honorific as an older brother), but does answer him "Onii-chan" as thanks for trying so hard to take care of her when she develops a fever. Mikan may not show it, but she cares very deeply for Rito and misses his company, and states how they used to play together before Lala entered their lives.

Mikan grows quite attached to Golden Darkness, perhaps due to Darkness seemingly being the same age as her.

Mikan is very perceptive and seems to be able to read people's emotions, even their reactions, most of which is Rito's obvious anxiety around Haruna and Yui's more than subtle feelings for him (Mikan even calls him a "playboy" for attracting so many girls).