Leicester

Leicester was a second grade vampire adept of the viks family.

After he advanced to 1st grade he went to saboru clans land to further purify his bloodline.After the clan found him they sent Anderson and a few more adepts to expel him out of the territory. When he was expelled he left behind a vial of his blood which was used by anderson to experiment on apprentice adepts,creating mary who indirectly became Leicester's offshoot.

After Mary returned from the knights plane he noticed her existence but ignored it, It was only after he advanced to 2nd grade that he found and captured mary.

After greem rescues mary Leicester comes to fire throne with his clans 3rd grade adept where he forces the saboru clan to cut ties with greem so he could kill him and mary. After this greem uses the 3rd grade dragonborn to make the 3rd grade vampire run away he capture Leicester and takes him to Alice so that she could use his bloodline origin to destroy Mary's bloodline shackles and make it possible for mary to advance using the blood moon prayer ceremony.(chapter 565)