Ciel: 14 old boy ,blue hair and eyes. He has a twin brother, on their 10th birthday, their parents were killed, ciel and his younger brother were stolen to a church and tortured till ciel became the victim of summoning the abyss and died. A grim reaper (undertaker) brought Ciel back but He needs constant chelation and infusions of blood  to function. His body cannot produce its own blood from bone marrow. Ciel is smart(He is not a cry baby). Undertaker is a male grim reaper with an unknown past

Ciel's elder brother

Edgar was born in England, raised by a wealthy family. With his long silver hair, gray eyes and well built body, he was such a charmer. His passion for knowledge led him to become a well known researcher. But the same knowledge became his downfall. 
One night some men broke into his house in an attempt to steal his research as he tried to stop them They shot him, multiple times until he died for blood loss. But no one paid much attention, as his murderer never got caught.