Scar

Scar (スカー) is a Grave Keeper who Ai and Hampnie met. She's called «Scar» due to the scar running from her right brow to her eyelid. Before that she was also called «Murderer» and «Grim Reaper». Unlike Ai, she controls herself as a person of perfect virtue and has no emotions.

Background
Scar is a Grave Keeper, this means she appeared on planet Earth without a trace and was sent by God to dispose undead and assist the living. Primary objective of gravekeepers is to assist living people while at same time they have urge to seek and bury the dead. She  cannot cause harm to living people, however she has great strenghth and can be quite violent with dead people,  while doing her gravekeeper job or protecting those who are alive.

It seems gravekeepers are unable to understand that dead people don't want to be buried and she ignores their wishes. Because of that, undead see Scar as enemy and fight for their "lives". Scar is called names such as "Reaper" and "Murderer" and probably got that scar after she was injured during one of the fights.

Personality
As remarked by Hampnie Hambert, Scar bares no ill manner towards anything bcause she has no emotions. She answers all the questions that she has been asked and responds to them without hesitation and obeys all requests of living people. She keep her smiling face through most ordeal.

While spending time with Ai, Scar gradually gets more emotinal and human like. She is scared of that change and runs away from eveyone hoping to turn back to her old self but later she accepts her new role as mother of recenty adopted Celica.

Appearance
Scar is a pretty female with purple hair that falls down to her lower back. To match this, she has lilac eyes and lilac eyebrows. To match her purple look, she wears a purple outfit and carries her Grave Keeper's spade.

Relationship
Celica Hecmatika -  Ulla's older twin sister who was frozen in time. Ulla and Celica mother's dying wish was for everyone to befall death. Her dying wish gave Ulla her powers of murder, but Celica rejected the wish, thus having her not flowing within time. Scar realizes that the voice crying to her is really Ulla's older sister, Celica. She saves Celica by touching her and returning her into the flow of time. She then adopts her as her own daughter.

Ai Astin - Ai and Scar don't really bond much in the beginning. When Scar doesn't feel well and Ai wants to stay with her, Scar says she'll just be a bother to her. Scar does stay with Ai on her journey, along with Julie. It seems Scar does care for Ai even though she finds Ai annoying. Scar also mentions in the chapter 19 of the manga when she rushed in the storage to bury the dead who captured Hampnie Hambert; that she has to obey Ai who told her to "Just stop...", since Ai is of a higher rank that Scar.

Julie - Julie and Scar don't really seem to bond until after the events of Gola Academy when Scar disappears. Scar is then shown to always be by Julie's side whenever they go out together. Whether Scar has romantic feelings for Julie is unknown, but they have gotten closer since the events after Gola Academy.