Impostor Captain Tennille

The Captain Tennille imposter is an enemy stand user of Part III: Stardust Crusaders.

Appearance/Personality
The imposter appears as a tall, muscular man in his late thirties. Though the reader is never shown the true Captain Tennile, one can assume that he was practically identical to the imposter, since his men, who had worked for ten years on the same ship, did not even suspect the replacement.

The imposter appears to be very patient, as he originally planned to separate the protagonists and kill them one by one. Once his schemes are spoiled by Jotaro, he does not lose his calm, saying that it will be no problem for him to kill them all at once from underwater.

He also seems to be fond of the ocean, being rude towards Jotaro after seeing he was smoking and asking if he was going to throw the ashes and the cigar in the water.

Stardust Crusaders
The imposter appears on a boat that Jotaro Kujo and company have taken to go from Hong Kong to Singapore. After Jotaro and Runaway Girl are attacked in the water by a mysterious creature, Jotaro has become suspicious of the crew members and believes one of them may be a Stand user.

Although Joseph Joestar insists that the Speedwagon Foundation had checked his credentials, Jotaro decides to find out if he is the culprit anyway by playing a bluff on him: he says that breathing even a minimal quantity of smoke causes a big vein to appear on the nose of a Stand user. Captain Tennille immediately falls for it, and reveals that he is actually an impostor of the real Captain Tennille, who he had killed earlier in Hong Kong bay.

He tries to take the Runaway Girl as hostage, but before he manages to do so he is stopped by Star Platinum. The Imposter however drags Jotaro underwater with his stand Dark Blue Moon, where his Stand can fight at full power. He traps Jotaro into a vortex, attempting to slash him with Dark Blue Moon's razor scales. He even manages to create some sort of little Cirripede-Stands that drain energy from his opponents' Stands.

Finally, by exploiting Star Platinum's ability to stretch his index and middle fingers, Jotaro stabs the enemy Stand and rips half of his head, defeating him, but in a last ditch effort, Captain Tennille blows up the ship, leaving the protagonists to meet their next Stand encounter, Strength. Tennile, however, is left to die in the sea.

Trivia

 * The imposter's real name was never revealed, and he is only known as «The Fake Captain Tennille».
 * The imposter's lung capacity surpasses human average by three times, and through practice, he can stay underwater for more than six minutes without breathing.