Shikashi

Shikashi is the man who lives in the Astral Observatory in The Legend of Zelda: Majora's Mask.

Ocarina of Time
The lakeside doctor in Lake Hylia could be the Hyrule form of Shikashi. He is involved in the sidequest for the Biggoron's Sword.

Biography
Shikashi is a professor of astronomy. He has been enamored with the moon since he was a child and that he spends his days gazing at the moon through his telescope.

He also has a Moon's Tear on display in his observatory. He explains that they have lately been blazing from the moon's eye, causing him to call them Moon's Tear. He also says they are rare stones and are valued by many in Clock Town.

Role with Deku Link
Shikashi plays a small part in helping Link in his Deku form caused by the Skull Kid. After learning the secret code from the Bombers, Link enters an alley which eventually takes him to the Observatory. Here, he meets Shikashi, looking through his telescope.

When Link speaks to him, Shikashi reveals the Skull Kid was at the observatory recently and threatened to break his instruments and steal his Moon's Tear. He then lets Link look though his telescope, where he sees Skull Kid on top of the Clock Tower.

When Link zooms in on Skull Kid, a tear falls from the moon, which Shikashi lets Link keep for himself and ponders how Skull Kid got on top of the Clock Tower.

Responses
Depending on which mask Link wears, Shikashi will respond differently to him. If he talks to him with no mask on, Shikashi will ask him if he is a friend of the Bombers and that he should develop his interests while he is young.

Deku Link
When Link speaks to him in with the Deku Mask on, Shikashi will tell him a bit about Skull Kid and let him look through his telescope.

Goron and Zora form
When Link speaks to him with either the Goron Mask or Zora Mask on, Shikashi will tell him his name and that he is a professor of astronomy. He also says that he was very interested in the moon as a child and now spends his days gazing at it from his observatory. He tells Link that the moon has been considered a mystical body, which people have worshiped and feared, showing how the moon has a cosmic influence that affects their daily lives.

Shikashi goes on to say that there is something wrong with the moon. It is as though the moon is being pulled down towards Termina by something and is slowly drawing closer.