Kariya Matou

Kariya Matou is a hero from Fate/Zero. He is the son of Zouken, the brother of Byakuya, and the uncle of Sakura and Shinji, and is the master of a Berserker-class servant during the fourth Holy Grail War.

Personality
Kariya is a good-natured person whose reason for originally leaving his family was out of disgust for their horrible and inhumane practices. He was willing to give up on pursuing a romance with Aoi because he genuinely loved her, and initially thought she would be happy with Tokiomi. He is shown to be good with children with both Rin and Sakura taking a strong liking to him.

Kariya also displays a strong determination and a remarkable capacity to endure pain and suffering after Crest Worm implantation. Due to Crest Worms also slowly eating away at his brain and the constant pain he has to endure, Kariya also becomes unable to perform complex thinking, and causes him to be easily manipulated by others as a result.

Though he genuinely wishes to save Sakura and help Aoi, he is unable to understand that despite giving Sakura away, Aoi still truly loves Tokiomi and she does not want him and Kariya to fight. Oblivious to Aoi's true feelings, Kariya makes Tokiomi's death one of his main goals in the war.

At the end, his deepest wish is revealed: to win Aoi's heart, and to be called 'Daddy' by Sakura and Rin Tohsaka.