Sky

Sora (dubbed: Sky) is a dungeon guardian of The Dungeon of Black Company. Sky is Rim's younger sister as well as the Demon Lord of the future that recruits Kinji to save the planet.

Appearance
Sky bears a familial resemblance to Rim, albeit with dark skin, white hair and black horns.

Nameless Majin
When first introduced, Sky was an incomple Majin that had very little intelligence and would only attack viscously against Shira. According to Rim in the anime, Sky had been calling for help due to being an irregularity.

Nameless Demon Lord
Later on in the future, Sky becomes the nameless Demon Lord. Being mature, well-spoken and represents great authority as the demon lord, Sky led a great war between her forces and Raiza'ha over the fate of the world. Having been very manipulative as she was the one who orchestrated events for Kinji to arrive in the future and made steps to ensure he would come to her. As the Demon Lord, Sky admitted that she cares not for humanity. Holding no bother in how society is structured and what becomes of the people. Considering humans to be greedy for always wanting the treasures deep in the dungeons. Even so, despite not wanting it, Sky went to war with humanity when, due to Belza Shuba'ha, demonite was being taken to fast which disrupted the planet itself.

Ultimately, despite having no intentions of losing to Raiza'ha, Sky's goal is to have Kinji erase the future and change it for the better. Though she was willing to let him go back to Japan if he wanted to. She also desires to have Rim find her past-self, as while she held no resentment to Rim, she was indifferent to her but implied she wished to be together with Rim.

She also considered her sister to be stupid.

Sky
Back in the present, when found by Kinji and Rim, Sky was introduced as a sickly and angry child as a result of being born as an irregularity. Only being calm around the Queen Ant who became her caretaker for a bit after the Queen Ant discovered her. Due to her defeat at Rim's hands, she was very resentful towards Rim. This was expressed by biting her head and throwing large tantrums. Rejecting Rim's attempts to give her food and constantly cried to be away from her. However, when Rim worked to ensure Sky's recovery, the latter warms up to her and even becomes a bit possessive.

Later on, after Kinji's success in the world, Sky becomes similarly calm and mature like her Demon Lord self despite her young age. Becoming very responsible when it comes to managing the dungeon and polite to those around her. According to Rim, Sky is rather strict with her as Sky wishes for Rim to think beyond food.