Ryuuji is one of the playable characters in Crossover X. He is a brown, sunglasses-wearing dog with purple ear tips. He is the most defense-oriented of all the characters, having high defense, low speed, and average attack. He is not playable in Single-player; he is multiplayer-exclusive. As such, he has no role in the story, though he is in the hub world of Ghiria. He's sitting next to the portal back to the Planet Select screen. Talk to him and he says "Hey. You can play as me if you're the fourth player in Multiplayer mode."