The Floating Whirlindas

The Floating Whirlindas, the Dancing Couple (Japanese: ダルッテンふさい Darutten Man and Wife) are two of the Portrait Ghosts who escaped imprisonment in Luigi's Mansion. According to the Game Boy Horror, the Floating Whirlindas used to be the local waltz champions, but unfortunately they aren't allowed to compete anymore because their feet can't touch the ground. The Whirlinda couple were found in the Ball Room on the first floor's east wing of the mansion. They appeared after Luigi defeats the six Shy Guys in the room, making the dancing floor spin as they waltzed. Luigi had to face away from them and wait until the gentleman exclaimed "Dance!". Both would then do a dance pose, making them vulnerable. Additionally, Luigi had to stand on the spinning tiles too, or the couple won't even appear when Luigi wasn't pointing at them. After some medium tugs, Luigi earned the key to the Storage Room.

Trivia

 * Unlike Henry and Orville and The Clockwork Soldiers, the Whirlinda couple are both caught at once. Also, both of them together have 100 HP, instead of 100 for each.
 * The Floating Whirlindas, along with Madame Clairvoya and the Clockwork Soldiers, are the only human-esque ghosts in the game that have an unknown age.