It resembles a pair of headless ballroom dancers with a floating silver heart with the Lovers mask on it between them, as if the silver heart was their head.
Persona 3
Natural Dancer is a sub-boss, found on the 110th floor of the Yabbashah Block in Tartarus. It impedes the player's progress and must be fought in order to continue. It later reappears as a normal enemy in Empyrean.
The Natural Dancer tends to spam Sexy Dance to mess up the party's actions, and hitting with its Wind spells while the party is either attacking each other or doing nothing at all. Yukari is a good option in this fight as the boss' Wind spells will do negligible damage to her while she can heal other party members. Aigis is also useful for getting rid of Tetrakarn, as using the Rush command will reflect her pierce attacks back at her for minimal damage while removing the Tetrakarn. One option is to simply enter the battle alone with a Wind-resisting Persona, hence nullifying the bad effects of Charm and reducing the amount of damage this boss can deal. A favorable Persona to have is Ghoul or Yamatano-Orochi since they both resist Wind and can learn Ice skills with fusion, it does not resist Distress. Orobas will completely block damage from its Wind attacks, leaving the protagonist free to deal with its other abilities.
Persona 4
Natural Dancer appears in the 8th and 9th Paradise of Heaven within the Midnight Channel. It will use Marakunda on the party before attacking. After being defeated, it may drop Hemp Cloth. Selling 6 Hemp Cloth will unlock the Elint Duffle female armor in the shop.
In Golden, it appears in the same Paradises above. It may drop Aurora Quartz for trade at Shiroku Pub.