The Riga Pratica is the Pilot of the "Next" Silver Hawk. This pilot appears in Dariusburst game.
Taken from the famitsu.com on Dariusburst
Pilot of the Silver Hawk Burst "Next". A Human male who's a test pilot of the Darius military. "Riga Practica" is not his real name, but is a code name given to him. In an old language it means "Rookie with Stripes". His wounds that he received during various tests reminds him of what he sacrificed to gain position as a Test Pilot.