Kotake and Koume are two witches who are said to be Ganondorf's surrogate mothers. Kotake can control ice, and Koume can control fire. When combined, they are referred to as Twinrova.
Ocarina of Time
When Link enters the Spirit Temple as a child, Nabooru convinces him to retrieve the Silver Gauntlets for her. He gets them, but before he can return to her, Koume and Kotake kidnap Nabooru. When Link returns to the Spirit Temple as an adult, they force him to fight the brainwashed Nabooru.
Link must then defeat them in a boss battle. In the first stage of the battle, he must reflect Kotake's ice beams at Koume and Koume's fire beams at Kotake. They will then merge to form Twinrova. Link must store three of the same elemental beam in his mirror shield, causing it to shoot back at Twinrova. She will collapse, giving Link a chance to damage her with his sword. After they have been defeated, they ascend to heaven while bickering about who is the younger sister.
Koume is in charge of the Swamp Boat Tour. Link first meets her in the Woods of Mystery. She is injured from an attack by the Skull Kid. In order to help her, Link must give her a bottle of Red Potion. She will then return to her job. If Link stops by, she will offer him one free boat ride for helping her.
Kotake runs the Magic Hags' Potion Shop, selling Red Potion, Green Potion, and Blue Potion. She will only sell the Blue Potion if Link has given her a Magic Mushroom within the current three-day cycle. If Link tells Kotake about Koume's injury, she will give him his first Bottle, filled with Red Potion. If she has already given Link a bottle, she will simply fill it with Red Potion for free.
After completing the Woodfall Temple, the poisoned water of the Southern Swamp will disappear. If you've also saved Koume within the Woods of Mystery, she will begin to run Koume's Target Shooting where Link can earn a Piece of Heart in the Nintendo 64 version of the game, or an Empty Bottle in the 3DS version of the game.
Oracle of Seasons/Oracle of AgesGanon. They enact their plan by persuading Veran to wreak havoc in the land of Labrynna, and Onox to do the same in Holodrum. The actions of Veran and Onox will light the Flame of Sorrow and Flame of Destruction, two of the three needed in the ritual to revive Ganon.
Though Link put an end to Veran and Onox, the damage done to Labrynna and Holodrum proves to still be enough to light the first two flames. To finish the ritual and light the final Flame of Despair, Twinrova kidnaps Princess Zelda to use as a sacrifice.
Once Link is able to defeat Koume and Kotake separately, the two fuse into one entity and become even more powerful foe. After Link defeats Twinrova, thus saving Princess Zelda, the witches choose to sacrifice their own body as a vessel to revive Ganon. However, because the ritual is not carried out using Zelda as planned, only a mindless, yet dangerous Ganon is able to be revived.
- In the 3DS version of Ocarina of Time, "Twinrova" is removed for the descriptions of Koume and Kotake. Instead of being "Twinrova Koume" and "Twinrova Kotake," they are just known as "Koume and Kotake."