La or Koizilla, or else known as the Ocean Spirit, is a secondary character in the Avatar franchise. A water spirit, serving the Nothern Water Tribe in North Pole, La seems to portray the role of guardian, protecting over the capital city of the tribe. She appears originally from the Siege of North chapter in Avatar: The Last Airbender. Though, La herself doesn't make a physical appearance in the villains tournaments, her water abilities are used by several villains, on purpose to eliminate La's true enemy in the original series, Admiral Zhao.
Disney Vs Non-Disney Villains War - Part Three
Non-Disney Villains Tournament
When a weakened Zhao is brought before Mrazomor, the Ice Emperor summons a powerfull water spirit, that it looked identical to that of La, to grab the Fire Nation's admiral and drown him into the seas below.