Theo

Theo (ティオ) is one of the orphans that were found in Goldy Pond.

History
Not much is known about Theo's past, but it is revealed that he was raised in an orphanage. At some point, he said farewell to his teacher at the house he was at and was sent to Goldy Pond. Although he and the others were briefed to hide from the monsters when the music played, Theo thought that the monsters weren't real and chose to ignore the truth.

Search for Minerva Arc
Theo, Monica, and Jake were first introduced in Goldy Pond, in which they were going through their first encounter with the Poachers. Theo was presumably hurt in the encounter. However, Emma swung an axe at one of the Poachers and told the orphans to run.

After reaching safer ground, Theo and the others briefly introduced themselves to Emma. He thanked Emma and the unknown girl for saving them. They were then told to tell the monsters to come after her if they were to be killed, and then they split up, with Theo, Jake, and Monica heading downwind of where they were.