Nier - NieR Replicant
Nier is the protagonist of NieR Replicant who searches for a cure for his sister Yonah in Act I of the game. He encounters a magical tome named Grimoire Weiss as well as two other companions, Kainé, and Emil who travel with him throughout the story.
Refs: 1-3 Outfit
Larger ref image: https://i.imgur.com/DrCrwt6.gif
Part of a group entry, check out the others with the "replicants" tag!