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The Star Spirits consist of Eldstar, Mamar, Skolar, Muskular, Misstar, Klevar and Kalmar. They all appear in Paper Mario and are being held captive by Bowser's followers after Bowser and Kammy Koopa stole their precious Star Rod and turned them into playing cards, because of their ignoring Bowser's selfish wishes.
After Mario rescued them, they gave him a special power called Star Beam, which is used to neutralize the effects of the Star Rod, and a ship that they can use to travel to Bowser's Castle. During the final battle with Bowser, due to the effects of Bowser's Power Platform, their Star Beam didn't work against him, unless Star Beam was upgraded to Peach Beam when Twink helped Mario out in the battle.
The Star Spirits' Names and powers
Duties in Mario Party 5
Mario Party 5
Names in other languages