Gerónimo "Harry" Bazán
Gerónimo "Harry" Bazán is a teenager who lives near—but not in—Teras Terrace. When Niamh meets him online, they develop a relationship somewhat hampered by the awkwardness of the fact that he can't readily visit her, given the secrecy surrounding the true nature of Teras Terrace.
A chess aficionado, Harry is especially fond of chess variants, including those involving "fairy chess pieces", chess including nonstandard pieces. He's invented some chess variants and pieces of his own, such as the "stoat", a piece that moves and captures like a queen but defects to the other side after making a capture.