Inga

Age: Appears 13-14
Height: 155 cm (5'1")

A mysterious handsome boy who goes along with Shinjuurou. It seems that he and Shinjuurou are tied together by a curious bond, but no one knows the nature of it. Inga is usually protected by Shinjuurou, but when a crisis is at hand...

(Source: Un-Go offical site)

"He" can actually change into other form, a tall and sexy woman, especially when he's excited.

Inga's female body belongs to Yuuko Kurata and she helped Shinjuurou take control of his own body when Inga was inside of him.