Twinrova

Sorceress Sisters Twinrova are Twin Witches who have the powers of Fire & Ice. Their names are Koume and Kotake.

Ocarina of Time
They are described as Ganondorf's surrogate mothers. Link fights them as the Spirit Temple Boss. To defeat the two frightening witches, the player must have the mirror shield equipped. When one of the old witches fires a beam of fire or ice at Link, pick up your shield and then immediately target the other witch and let it hit her for a few seconds. After you do this three times to each witch, they will fuse to create one youthful and extremely powerful witch, who is the true boss. Sadly, this part is much easier. When she fires some magic, let it fly into the mirror shield and collect two more of the same element. NEVER put two elements together. After about 20 hits the witches will be defeated and for some strange and unfathomable reason..... go to heaven.

Oracle of Ages & Seasons
In a special linked game ending you get to fight them and Ganondorf.

The Legend of Zelda: Majora's Mask
Twinrova appear in Majora's Mask, but being Termina is an alternate reality, they are good instead of evil. They reside in the Southern Swamp, operating a potion shop and the Swamp Boat Cruise. They use special mushrooms to make their potions. Link finds Kotake immobilized from an attack by the Skull Kid in the Mysterious Woods and, aquiring a red potion from Koume, revitalizes her power so that she can return to her post at the Swamp Boat Cruise.

Trivia
 The word "Koume" is a type of Japanese pickled plum. The word "Kotake" is a type of Japanese mushroom. 