The power to manipulate one's own speaking and singing voice. Sub-power of Sound Manipulation.
Precise Vocal Muscle Control
Vocal Cord Control
The user is freely capable of manipulating their voice, allowing them to control their voices to imitate sounds of creatures such as animal noises and explosions or increase or decrease the tone of their voice.
Jacob Pevsner (Lego Ninjago: Masters of Spinjitzu)
Rita Santos (Mako: Island of Secrets)
Lyla (Mako: Island of Secrets)
Nixie (Mako: Island of Secrets)
Zac Blakely (Mako: Island of Secrets)
Merrill Young (Vampire High)
Cleveland Brown (Family Guy)
Zirconia (Sailor Moon SuperS)
Witches (Sabrina, the Teenage Witch)
Discord (My Little Pony: Friendship is Magic)
Twilight Sparkle (My Little Pony: Friendship Is Magic)
Starlight Glimmer (My Little Pony: Friendship Is Magic)
Leslie Meyers (South Park)
Beardo (Total Drama)
Gerald McCloy (Gerald McBoing-Boing)
Forest Dragons (The Last Dragon)
Alex Mercer (Prototype)
Freddy Krueger (A Nightmare on Elm Street)
Cell (Dragon Ball)
A Predator (Predator franchise)
Willow Rosenberg (Buffy the Vampire Slayer)
Aku (Samurai Jack)
Ixis Naugus (Archie's Sonic the Hedgehog)
Suki Sato (Tower Prep)
Discord (My Little Pony: Friendship is Magic) can alter his voice at will.
Twilight Sparkle (My Little Pony: Friendship is Magic) can also alter her voice via her Magic.
After swallowing a tiny computer, Finn (Adventure Time) can autotune his singing voice on command.
Laughing Octopus (Metal Gear Solid 4: Guns of the Patriots)
Cécile Cosima Caminades (Metal Gear Solid: Peace Walker) can perfectly mimic animal sounds such as bird calls.
Obito Uchiha (Naruto) disguised his voice while wearing his mask, to sound like either Tobi or Madara.
The Song Card (Cardcaptor Sakura)
The Voice Card (Cardcaptor Sakura)
In order to trick the senshi, Zirconia (Sailor Moon SuperS) had made copies of himself and duplicated the senshi's mirror images and was able to mimic their own voices in order to stop them.
By changing the flow of gases from their flight bladders, Forest Dragons (The Last Dragon) can imitate the cries of its prey to either avoid drawing attention from prey or lure predators into an ambush.