Miyuki Minase

Miyuki Minase (水無瀬 ミユキ) is a character in Digimon Survive.

Description
Despite her youthful appearance, she is actually thousands of years old. This is because when she was a child, half of her soul was stolen by — which causes her to lose the ability to physically age. This also causes her to struggle to talk, with most of her personality being removed during the process. When she regains her missing half soul, thousands of years after losing it, she is finally able to return to her normal self and also begins physically aging again. The thousands of years in the alternate world was equal to 50 years in the human world, so in the human world so would be considered to be around her 60s.

As a female descendent of the Minase family, she has the ability to open the gate between the alternate world and the human world by singing the song of the Minase Maiden.

Development
Miyuki's design highly resembles one of the scrapped designs for Aoi Shibuya, indicating said scrapped design was reused and tweaked for Miyuki.

Fiction
in 1970, 50 years in the past (thousands of years in alternate world time), Miyuki and her brother Akiharu "Haru" Minase were transported to the alternate world. Miyuki became partner to, with the two becoming the best of friends. When they are attacked by the Kenzoku, Miyuki sings the song of the Minase Maiden, which opens up the gate to the alternate world. It sucks Aiharu into it and sends him back to the human world, with Miyuki having done this to keep him safe. With him now in the human world, Miyuki awaits in the alternate world for him to return.

At some point, steals half of Miyuki's soul which causes her to be unable to age and struggle to talk to others. Renamon is able to keep Miyuki safe, though wanting to help her keep her sanity, uses his powers to make himself appear as Akiharu and refers to himself using Akhiharu's nickname, Haru. He does this for thousands of years (equal to 50 years in the human world) and does it for so long that Miyuki forgets about Renamon's existence.

When the children are summoned to the alternate world, they come across Miyuki and "Haru" in the school. The duo join the children's group, and join them in their efforts in looking to return to the human world.