Sakura Matou (Fate/Extra)

Sakura Matou (間桐 桜) is an alternate version from her Fate/stay night counterpart that appears in Fate/Extra. She is an NPC character within the Moon Cell's virtual world.

Personality
Sakura is very soft spoken and caring; this personality is robotic and repetitive, as she was programmed to follow a specific role by the system of the Moon Cell. However, in certain situations, she can also display strange and out of character behaviors that creeps out the Protagonist.

Fate/Extra
Sakura is first introduced as Shinji's younger sister who works in the nurse's office. As the end of the prologue approaches, Shinji realizes that, while he'd always wanted one, he'd never had a younger sister. Sakura's programming malfunctions during this revelation, exposing her as an NPC programmed to think she is related to Shinji.

During the Holy Grail war, Sakura resumes her position in the nurse's office, handing out weekly supplies to the participants and also tends to any injuries they may suffer during the war that are not a result of "standard" combat; it appears that if she were to leave the office too long, she could lose her job. She is well known amongst Masters and NPCs for her delicious lunches.

Due to her long, purple hair, she poses as Rider in the third episode of the TYPE-MOON MOVIE Ace 2nd specials, which causes others to call her Sakurider (サクライダー). Her role is also mixed with the regular Sakura of Fate/stay night, allowing her to become Dark Sakura (黒桜).

Fate/Extra CCC
During Fate/Extra CCC, she is has a vastly expanded role. The characters BB, Meltlilith, and Passionlip resemble her.