Middymo

Zelda (Crystal) : Several generations ago, to keep the Machine powered, the royal family gave up a piece of the Triforce they had. This came with a slight caveat. Previously, the Heart Engine, the source of power for the Machine, was maintained by a group of skilled engineers delegated by the people as trustworthy, but the royal family wanted to make sure their piece of the Triforce was well-guarded, so over time, they gained complete control of the Heart Engine, putting shrine maidens in the place of the engineers, and keeping the engineers outside. Zelda was chosen shortly after her birth to be a shrine maiden.

Shrine maidens have a difficult job, and once they're officially in the Central Engine, they can't leave. Giving up everything they knew before is pretty rough, so future shrine maidens usually try and live as full of a life as they can before they make their journey into the Heart Engine.

Zelda...well, she's trying her best. She's tried to pick up every single hobby under the sun, devours books, and when she can, she explores dilapidated areas of the Machine, but she still isn't content. Everyone's happy to make friends with her, and she's friendly back, but she doesn't really connect with anyone, masking her true desires and the overwhelming fear she has of her fate.

Link (Sprocket): A commoner boy that wants to become an engineer someday. He lives in the crowded community of Left Leg, but recently took up a job apprenticing with an engineer. Now that monsters live in most parts of the Machine, it's a dangerous job. Link loves to explore, and really admires the work of the original builders. He'd do anything to learn more about them and uncover the mysteries of his home.

Tusk: A monster that somehow gained sentience after being exposed to a mysterious blue crystal. He's the leader of a group of bokoblins that inhabit the Bowels, a long-forgotten part of the Machine filled with dangers. Slowly, he began to gain an awareness of his own senses, and took control of his own body. Monsters have an organ that can "see" certain types of magic, allowing him to navigate the Machine much more easily than a human can, read strange old messages left behind, and uncover little pocket dimensions. Now that he's broken free, he's started to get dreams where a fairy tells him to seek out a hero.