Impostor Captain Tennille

Captain Tennille (actually, an impostor of Captain Tennille) is the name of an enemy stand user of Part III, Stardust Crusaders.

Story
He 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 defeats him, but in a last ditch effort, Captain Tennille blows up the ship, leaving the protagonists to meet their next Stand encounter, Strength.

Appearance/Personality
Fake Captain Tennille looks like a tall, muscular man in his late thirties. Though the reader is never shown the true Captain Tennile, it can be assumed that he was practically identical to the Imposter, since his men, who had worked for ten years on the same ship, didn't even suspect the replacement.

He appears to be very patient, his original plan being separating the protagonists and killing them one by one. Once his schemes are spoiled by Jotaro, he doesn't lose his calm, saying that it will be no problem for him to kill them all at once from underwater.

Trivia

 * His character is named after the 1970 musical duo Captain & Tennille, famous for their hit single "Love Will Keep Us Together".
 * He uses the stand known as Dark Blue Moon, after the Tarot card "The Moon".
 * His name was never revealed, and he is only known as «The Fake Captain Tennille».
 * His lung capacity surpasses human average by three times, and through practise, he can now stay underwater for more than six minutes without breathing