Shuji is one of the minor antagonists of World Trigger. He hates everything that is related to Neighbor, so much so that even he wants to eradicate them all. Due to it, he even thinks of Yuma and Osamu as his enemy.
He is one of the workers of Border, an organization that's on protecting it's citizens against Neighbor. Otherworldly creatures.
He appears as cold and calculating. Due to what happened in his past... he has a hatred for Neighbor. Including Yuma, a Neighbor that is human.