>>2524865Gem Kingdom is also Legend of Zelda. Karl is Princess Zelda, Djidane is Nabooru, and Dark Lord is meant to be some form of Ganondorf. Puck & Arno from the King's Harem are also the Zelda characters Beth & Anju respectively.
Specifically, I think Gem Kingdom is meant to be Twilight Princess while Magic Forest is more Ocarina of Time.
Should also be noted that Plain of the Rituals' girls are only from FF's 8 & 10. We could see others included when the GH one rolls around, but it's something to note.