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Garfiel called Subaru his boss and treated him with respect.

Appearance: He has sharp teeth and strong arms and could transform into a huge tiger to protect himself from Subaru

The merchant in green clothes and with blond hair helped and was on friendly terms with Subaru

And after that Subaru will come for him and his head.

After the Archbishops' attack on the city of Pristella, Subaru decided to assemble a squad. He took Rem, who was unconscious and no one remembered her, Julius, who everyone had forgotten, Anastasia, Meili, and Emilia, and went with them to the Tower of Pleiades to figure out how to return Rem and Julius' memories and save the inhabitants of Pristella. In one of the tower's tests, Subaru loses his memories and, in order to get them back, he begins to kill and hunt his friends.

Appearance: Subaru is slowly going crazy; his hair has turned white, he's broken his head, and one of his eyes has become worse at seeing than the other.

Subaru himself almost never killed anyone. He was helped by Shaula, who considered him her master, and she helped Subaru kill his friends by launching very fast and hot charges at them.

Why Subaru kills everyone: Subaru kills everyone to regain his memories. After a person's death, his book of memories appears in the library in the Pleiades tower and Subaru wanted to kill everyone who knew Natsuki Subaru, so that he could then read their books and find information in these books about himself.