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|Light Novel||Volume 5, Prologue|
|Manga||Volume 6, Lecture XXVII|
Alzano Imperial Magic Academy
Kleitos Magic Academy (former)
Leos is a man of average height and weight with blonde hair that goes up to his shoulders; and has distinct green eyes.
Leos was the Earl of the Kleitos Family and next in line for the main line before he passed away. He was engaged to Sistine prior to the series due to a childlike promise from Sistine. The engagement was cancelled due to Leos's death. The reason behind his death was caused by Jatice, who had caused him to overdose on the drug Angel Dust.
Leos and Sistine were childhood best friends as they were also engaged.