Repliku is a replica of Riku who is more aggressive and protective than him.A difference between the two is as follows: Riku feared the darkness in his heart,but the Replica embraced his and wielded it effectively.He is also more stubborn,contributing to the fact that he is a persistent enemy.Another prominent factor is his search to discover more about his existence.He tends to become angry when faced with confusion of any sort.Shown when the organization members Larxene and Vexen deceived him.

Replica Riku also goes by the name Repliku

Anti-Sora’s purpose is to destroy Sora and his friends (failed)
Anti-Sora is a shadowy doppelganger of Sora
Anti-Sora can teleport in and out of shadows,duplicate himself and attack in a similar manner to Sora himself and comes with a considerable amount of health and attack power: like many doppelgängers Anti-Sora doesn’t really talk and is almost completely devoid of emotion,seeking only to destroy Sora and take his place.
Anti-Sora is a near-perfect replica of Sora.