When you enter the One on One section of the Arena, you are greeted by Dino, a red, black, and yellow Dinaurian Archaeyx with sharp onyx eyes. Behind him you see a large black Diluscion roaming around in the background, chasing away intruding Sky Saurians.
"Welcome to One on One. I will be your host for the fights you create or participate in." He says before turning away, and he adds, "Oh, and that's Virus; don't get on his bad side or he'll probably kill you," before walking away.