Thoma (blind).

Thoma, who had been faithful and royal to the bone was struck down with a single blow. Only a single thought running through his head as he did so. 'I must protect Ayato!' his dedication knew no bounds leaving him pacified for a while.
Apon his awakening he is truck with an unsettling realization. "my eyes.. They're open but it's so dark." he doesn't know how long he sits there for as time seems irrelevant to him until he hears a familiar voice. "Waka are you alright? I-" before he could finish

Thoma protects Ayato during a battle leaving him blind.
Now he must learn to work around it or become dependant on Ayato.

You are ayato