Xenoblade developer Monolith Soft is the developer behind Project X Zone. They also made Namco X Capcom and it feels like Project X Zone is in a way a spiritual sequel to their PlayStation 2 game.
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Most characters are in pairs, but a few like Ulala from Space Channel 5, Bruno from Dynamite Cop, and Valkyrie from The Legend of Valkyrie can join a team for a triple attack. Check out the latest confirmed Sega, Namco Bandai, and Capcom stars below.
Chun-Li from Street Fighter and Morrigan from Darkstalkers
Haken Browning and Kaguya Nanbu from Super Robot Taisen OG Saga: Endless Froniter
Valkyrie from The Legend of Valkyrie
Gemini Sunrise and Erica Fontaine from Sakura Wars
Bruno from Dynamite Cop