Lightning Angler

The Lightning Angler is an Emblem Heartless that appears in Kingdom Hearts III.

Story
Sora, Donald and Goofy are exploring the underwater cave system of the island they've washed up on in search of a new ship. Sora spots a treasure chest at the bottom of an open area, with two glowing pieces of "kelp" next to it. Donald finds the whole thing suspicious, but Sora tells him they wouldn't be good pirates if they turned down treasure. He tries opening it with the Keyblade, altering the Lightning Angler that prey has arrived. It springs up and swallows Sora, but immediately spits him out due to the Keyblade hurting it.

Upon its defeat, it crashes into the wall of the chamber, revealing a new path forward into the cavern.

Design
The Lightning Angler is an electric Heartless with the appearance of an Anglerfish. It is blue, has electricity patterns spread across its body, and whiskers with lightning bolts at the end. Along with that, at the end of it's tail it has what resembles a pirate ship's wheel and other pirate accessories such as hooks and anchors in the design. The aquatic heartless has blue, spike-esque teeth with a heartless emblem on the head.