[CacmanZero]

Klonoa knowledge cameo appearance Namco crossover to Keroro RPG: Kishi to Musha to Densetsu no Kaizoku DS 2010 year a here.

Klonoa Wii Remake:

Spoiler

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Namco X Capcom Guntz:

Spoiler

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[Spirit Macardi]

I've pointed this particular cameo out before. It's in the game as a gag because Klonoa and Keroro are both played by Kumiko Watanabe.