Replica

Replica is Yūma's guardian

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

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

Relationships
Yūma Kuga:

Osamu Mikumo:

Chika Amatori:

Jin Yūichi: