The Star Seeker is a Keychain for Sora's Keyblade and Mickey's Keyblade that is found in Kingdom Hearts Re:Chain of Memories, Kingdom Hearts II, Kingdom Hearts 358/2 Days, Kingdom Hearts coded, and Kingdom Hearts Birth by Sleep. In Kingdom Hearts 358/2 Days, it can be upgraded to the Star Seeker+.
In Kingdom Hearts II, Flora, Fauna, and Merryweather give Sora the Star Seeker, along with his new clothes, as the Keyblade for his new Valor Form. The Star Seeker is not initially available for Sora to use in his standard form, since it is set within the sub-weapon slot for Valor Form. As Sora must have a Keyblade in that slot at all times, the Star Seeker cannot be switched out until he obtains a third Keychain.
This is also the Keyblade that King Mickey used while he was apprenticed to Yen Sid, up until he acquired the Kingdom Key D. He also wields this Keyblade in Kingdom Hearts coded and Kingdom Hearts χ, and can equip it within Mission Mode in Kingdom Hearts 358/2 Days.
The guard appears to be two shooting stars. The blade is blue and decorated with stars, while the teeth is a crescent moon and a star. Strangely, in Kingdom Hearts Birth by Sleep, King Mickey holds Star Seeker in reverse, with the opposite side of the Keyblade used as the teeth. The Keychain design is a crescent moon. The Keyblade's name seemingly references Mickey and Sora's journeys to the various worlds, which are seen as stars. It also makes a reference to the worlds in the universe of Kingdom Hearts, since stars refer to the worlds.
The Star Seeker is part of a group of weapons associated with the Mysterious Tower, along with the corresponding staff and shield. These weapons are decorated with crescent moons and stars, and are the second set of weapons available to the party.
King Mickey can equip this Keyblade in Kingdom Hearts 358/2 Days Mission Mode by equipping the Pandora's Gear. The ground combo for this weapon starts with a horizontal slash to the left, followed by a horizontal slash to the right, a spinning slash, and ends with a large jump to the left with a dashing slash back to the right.
The aerial combo consists of a horizontal slash to the right finishing with a vertical slash upward, followed by the upward slash leading into a 360° spin with the Keyblade held above the King's head, and ends with a series of three thrusts as he descends.
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