Kevin is an young adult with short brown messy hair and usually wears a white coat.
Ten years ago, Bilin and Kevin where heading towards the Fest to participate in the biggest fight against the Earless in hopes to defeat them forever. However they witness Jimi Stonefree going rogue, causing them to fail their mission and eventually lose their country to the war.
Bilin sees similar light as Jimi's in a forest and follows it there, where she finds the Noise Sisters and defeats them. She saves Mu and Echo Rec and brings them back to Tremolo Technologies, where she tries to figure out who Mu is. Bilin sees Echo trying to fix his Equipment and comes out of his room for the first time in four years. He helps him fix it and as Echo recognizes him, he explains that he is scared of being a Player and piloting Sue with Bilin. Later Kevin and Bilin have a mock battle with Mu and Echo. They win and Bilin decides to let them go and tells Mu that she needs to visit the other Players as they hold secrets about Jimi.