Young Xehanort's Keyblade
From Kingdom Hearts Wiki: A world of information not accessible by Gummiship
Kingdom Hearts 3D: Dream Drop Distance
After Mickey Mouse casts a Stopza spell to aid Riku in rescuing Sora from the Real Organization XIII, Master Xehanort's consciousness overrides the spell by possessing and temporarily granting Young Xehanort the ability to wield his Keyblade, though he does so with this specific Keychain. Riku, however, defeats him and sends him retreating.
Kingdom Hearts III
During the second Keyblade War, Young Xehanort wields his Keyblade in battle against Sora, Riku, and Mickey.
This Keyblade significantly resembles Terra, Ventus, and Aqua's No Name, in that it is predominantly colored in different shades of blue and is decorated with elaborate, spiked shapes. The tip is modeled after a stopwatch, while the teeth are diamond-shaped spikes that are connected by a black web structure similar to the design on the base of the top spire of Memory's Skyscraper. The Keychain shares the time theme represented in the blade, with an hourglass as its token. Its shaft resembles Young Xehanort's Ethereal Blades, as does the blade with its neon like glow.
The Keyblade also includes attributes from Master Xehanort's No Name, such as the demonic wings at the beginning of the shaft, the horned lion[?] head at the tip similar to the goat head on the other Keyblade, and the Gazing Eye.
Young Xehanort can Formchange his Keyblade into a whip.