Hoshio, often called Hosshan, is a boy from the Special Ability class who must wear a mask at all times to control his Alice. His Alice allows him to influence the weather, and it is heavily influenced by his emotions; for example, when he feels sad, it rains.
However, his Alice gradually fades over time. This is why, in chapter 76 of the manga (his only appearance), his parents come to take him home from the Academy.
As a farewell gift, the rest of the Special Ability class gave him their Alice stones, including Mikan. Hoshio accepted all of them except for Mikan's, believing that someone else (Natsume) needed it more than he did.
Mikan and the others were present when he was picked up. On the day he left, there was a rainbow in the sky because he felt blissful.
