Arthur will have to face his nemesis Astaroth in Project X Zone. The king of the Makai is in the crossover Nintendo 3DS game as a rival character. One of Asatroth’s minions, the Red Arremer, also appears in the game as a level up fodder.
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Vile from Mega Man X, Selvaria Bles from Valkyria Chronicles, and Juri from Street Fighter IV.