Whyt is a summon featured in the Nintendo DS remake of Final Fantasy IV. The creature is summoned into battle by the character Rydia, and replaces her. It'll fight using the abilities that the player assigned to it, and there's no need to worrying about it running out of MP, as it has an infinite amount. After five turns, Rydia will return to battle and dismiss the Whyt.
In the game, the player can increase the stats of their Whyt by playing a variety of minigames that the Fat Chocobo has to offer, ranging in genre. When the player thinks that their Whyt is ready, then they can play with other FFIV users in the same room and battle each other. To customize your Whyt even more, you're allowed to draw a new face for it using the DS's touch screen.