Fish

The Fish is a monstrous sea creature that originates from the game Balloon Fight. In Super Smash Bros. Brawl and Super Smash Bros. Ultimate, the Fish appears on Summit, even though it is an Ice Climber stage, not a Balloon Fight one. When the tip of the iceberg falls into the ocean, the Fish sometimes jumps out in an attempt to eat the fighters. If the Fish successfully swallows a fighter, it swims to the bottom of the ocean, KOing them. The Fish's tail can also cause damage.

Trivia

 * The Fish's appearance on the Summit is the second connection between Ice Climber and Balloon Fight within the Super Smash Bros. series. The first is in Super Smash Bros. Melee, where the Balloon Fight theme would sometimes play on Icicle Mountain.