|Occupation||King of Sun Kingdom|
|Spouse(s)||Antonia (First Wife)|
|Relatives|| Leonidas II (Father)|
Leonidas II's second queen (Mother)
Rani Spiral (Younger brother)
Bardwin's sister (Half-sister)
Leonidas III is Livius's biological father and former king of the Sun Kingdom. He is presumed to be deceased, as the characters in the manga have referred to him multiple times as the "late king". The manner in which he died is still unknown.