Captain Fishook

Captain Fishook is a ghost enemy encountered in Luigi's Mansion 3. Captain Fishook is literally a ghost shark that serves as captain of his own crew. He resides in The Spectral Catch located on the twelfth floor of the hotel. Luigi fights him for both the thirteenth floor's elevator button and the Yellow Toad's portrait.

Biography
When Luigi enters his ship, he finds it empty with only the portrait of Yellow Toad. Shortly afterwards, Captain Fishook rises from the water and appears to Luigi. He reveals he has the thirteenth floor's elevator button hidden in underneath his eyepatch where his eye should be. He then proceeds to take possession to the ship's deck and engages in battle with Luigi. Captain Fishook will move around the deck trying to catch and chomp Luigi as a big wooden mouth with eyes, at the same time part of his crew (that are regular ghosts) will throw explosive barrels at Luigi to stop him enough time for Fishook to catch him.

In order to defeat Fishook, Luigi has to vacuum these barrels and throw them at him the moment he opens his mouth, causing the barrel to explode inside Fishook when he swallows it. The more damage he receives, the more angered he becomes. After eating the third barrel and exploding, Captain Fishook finally reveals himself and his crew disappears. He prepares to battle Luigi using his hook to harm him and using his eyepatch as shield to protect himself from getting sucked in. Luigi has to wait the right moment where Fishook lifts up to the air and attacks with his hook at the spot Luigi is, getting stuck in the process. This gives Luigi the chance to flash Fishook and vacuum him.

After his health drops to 100 however, Fishook will become angered and possesses his whole ship to battle Luigi, starting the final phase. He will overturn the ship ninety degrees backwards with Luigi having to use the Suction Shot on a strut with a bullseye icon near the ship's bow to avoid the attack. Afterwards, his crew returns again to continue throwing explosive barrels at Luigi. The same process of throwing the barrels back at Fishook must be done whenever he opens his mouth. Once Fishook reveals himself again, Luigi has again to wait for him to get stuck with his hook at vacuum in the spot. Before getting defeated, Fishook struggles in the suction to no avail, granting Luigi the thirteenth floor's elevator button and Yellow Toad.

Trivia

 * His name could be a reference to Captain Hook, the main antagonist of Disney's Peter Pan.
 * Just like Amadeus Wolfgeist, Captain Fishook takes possession of an inanimate object to battle Luigi.
 * He, along with Polterkitty, are the only antagonists in Luigi's Mansion 3 to be animal-based ghosts.