Rainfell

Unreleased Rain Fall (レインフォール) belongs to Aqua, one of the central protagonists in the prequel Kingdom Hearts Birth By Sleep. It is her main Keyblade, wielded at the beginning of the storyline until other Keyblades are gained by visiting other worlds.

Design
Its color scheme is various grays and blues, similar to Aqua's armor. The hilt is silver and noted to be separated from the shaft. The teeth jut out in a rounded fashion. The keychain at the end of the blade is a water drop.

It is revealed that Aqua can turn her Keyblade into a giant bow and platform and ride it to other worlds like a Gummi Ship.

Trivia

 * Interestingly, the bow and platform Rain Fall transforms into seems to be based more upon her "original" Keyblade from Birth by Sleep. This, however, is just an upgraded version of the Rain Fall.
 * The keychain on Rain Fall appears as a water drop. This is notable as Aqua means "Water" in Latin. The same can be said of Terra's earth-themed keychain (Terra meaning "Earth") and Ventus's wind-themed keychain (Ventus meaning "Wind").