Meet every character's request in an area and you'll get that particular rating to 100%, which in turn gets you these rewards. If unnamed (Yellow Drops, Dark Heaven Castle), completion of those Georamas is required for progress in the game.

Reward	How to unlock
Battle Ax	Get 100% in Matataki Village.
Macho Sword	Get 100% in Queens.
Mirage & Diamond	Get 100% in Muska Lacka.
Windmill Slash (new charge attack for Toan)	Get 100% in Norune Villag.