Replica

Replica is Yūma's guardian

Personality
Replica always gives Yuma advices, he tells him what's right and wrong. He also helps him in battles, when he prepared Quadra-Bolt for Yuma in chapter 15.

History
Replica is the one who told Yuma to come to Human World to see his father's friend. His real motive was to something about Yuma's dying body.

Relationships
Yuma Kuga:

Osamu Mikumo:

Chika Amatori:

Jin Yūichi: