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Mockingbirds are a group of New World passerine birds from the family Mimidae. They are best known for the habit of some species mimicking the songs of other birds and the sounds of insects and amphibians,[1] often loudly and in rapid succession

Power Copying - TV Tropes
Ordinarily, learning a new technique requires an instructor and long days of practice. However, some characters have the power to learn techniques just by watching someone else perform them a few times. Commonly, they can immediately do the …

Characters with this power tend to be very versatile and difficult to predict, capable of easily catching opponents off guard and beating them at their own game.
Discard & Draw: They can only hold one power at a time; gaining a new power rewrites the old.
Super Trope to:
- Cannibalism Superpower: The character copies powers by eating the enemy.
- Ditto Fighter: A fighting game character that copies the opponent's moveset.
- Power Parasite: The copied ability is actually stolen from the original user rather than duplicated.
- Victor Gains Loser's Powers: The character gains the opponent's powers after defeating them.