Reaper

He's human...except for one thing. He sold his soul to Death to save the life of his brother. Now he's Death's apprentice, wandering in between the mortal realm and the the land of the dead, reaping souls whose time has expired. He carries the Book of Souls that holds the picture, name, life story, and the time and manner of death for every soul that is living. Beside each name is a timer, counting down the years, months, weeks, days, hours, minutes, and seconds to the time of their death. When the countdown reaches zero death pays a visit.