Replica can use the powers of Yuma Kuga's Black Trigger. He also seamlessly wraps himself over Yuma's left arm when he activates the Black Trigger.
Also, the Trion soldiers Replica creates (like the Rabbit he gated in to help Osamu in episode 31 "Osamu Mikumo's Determination") can also use Kuga's trigger powers.
Is Replica part of the Black Trigger, or is he an independent component which shares the power?