Short answers, pulled from the story.
Square developed Final Fantasy Crystal Chronicles and chose Nintendo consoles out of financial necessity after a box office failure with Final Fantasy: The Spirits Within. The company founded a shell company called The Game Designers Studio to produce the game without interfering with other projects for Sony platforms.
Akitoshi Kawazu created the four tribes known as Clavats, Lilties, Yukes, and Selkies within the unnamed realm of Final Fantasy Crystal Chronicles. Kawazu served as the executive producer for the series and maintained a creative role in each entry.
The original Final Fantasy Crystal Chronicles was released in 2003 and sold 1.3 million units worldwide. Ring of Fates sold nearly 700,000 units worldwide while Echoes of Time sold 570,000 units.
Kumi Tanioka composed the majority of the music for the series and used medieval and Renaissance instruments such as the recorder, crumhorn, and lute. Hidenori Iwasaki and Ryo Yamazaki composed the music for The Crystal Bearers using an acoustic style inspired by American music.
The Crystal Bearers takes place 1000 years after the time of the original Final Fantasy Crystal Chronicles. This setting features the Yukes having vanished during a great war with the Lilties and crystal-based magic becoming a rarity.