Decided to add the Klonoa references from Namco x Capcom that I know of. Aside from Klonoa, Gantz, Lolo, Joker, Janga, and the High Priestess appearing we have:
*The Temple of the Heavens appearing in chapters 6, 7, 23, and to an extent, the final chapter. The outside in in Chapter 6, while the interior is in chapters 7 and 23, while just appearing in the intro for Chapter 24, and for a small scene in the ending. A piece of the mosaic seen outside appears in the final chapter as the starting point for that stage.
*Joilant is the setting for Chapter 15
*The Hero medal or Star Medal (can't remember which) appears as an item/equipment.
*Gantz' main goal is to get revenge against Janga, just like Klonoa Heroes. Unlike Heroes, Janga is killed by Gantz instead of falling into lava.
*After Joker hints at the merging of worlds seen in the final chapter, he self-destructs, just like in Klonoa Heroes, dud of an explosion and all.
*Stepping Wind is the battle theme for Klonoa and Gantz. Gantz' theme from Heroes plays in chapter 40.
*Klonoa and Gantz use weapons and attacks from Heroes. Klonoa is short range while Gantz attacks at long range.
