Ciel  

, シエル

Ciel is an android who can communicate normally, unlike Flandre who only says "Fuga". He comprehends Flandres language and has recollections of working in the deuterium mine of the kingdom around three years before the series began. While fleeing, he was moved by the sight of the sea and yearned for a life of freedom. Ciel encountered Flandre while strolling in town and assisted with maintaining Himes mansion. During his repair process by Flandre, he developed an affinity for her.