Leo Cuy is the son of Alesander and Rosamund Cuy. His father is the heir to Sunhouse who is the eldest child of Lord Leowyn Cuy whom he is named after.
Leo was born early on to Rosamund and Alesander. He is raised in Sunhouse, located in in the Town of Cuy. He likes to play blocks alongside his older sister, Melony.