Doopliss

"I'm busy thinking of new pranks and stuff! It's not easy either! Now get lost! ..Of course you guys WON'T. No way you ninnies go away quietly, am I right?"

- Doopliss

Doopliss is a Duplighost living in the Creepy Steeple in Paper Mario: The Thousand-Year Door. He appeares as an enemy of Mario several times throughout the game, and is the boss of Chapter 4.

History
Doopliss enchanted the bell of the Creepy Steeple, so that each time it rang, it would transform an inhabitant of the nearby Twilight Town into a pig. Mario, whose Magical Map told him that the Ruby Star was inside the Creepy Steeple, sought to help the inhabitants of the village and went to the steeple via the Twilight Trail. When Mario and his partners encountered Doopliss on the highest tower of the steeple, he was apparently watching TV.

In the fight, Goombella was unable to tell Doopliss's name, as it didn't appear in her log. Doopliss fought by transforming himself into a shady outline of Mario and attacking with his moves. Some time during this battle, Doopliss took on Mario's actual form and left Mario as the shadow of himself. Doopliss, as Mario, claimed to have defeated himself and won the Crystal Star. Having successfully tricked Mario's partners, he marched of to Twilight Town, leaving the actual Mario defeated on the floor.

The actual Mario followed Doopliss back to Twilight Town, where he met the ghost at the village's entrance. Doopliss, preparing to fight Mario, offered him to try guessing his name first. He said that, by defeating the original person, it was possible for him to truly become someone else. After Mario was unable to guess the correct name, Doopliss enganged battle with him. However, both the fake and the actual Mario where unable to damage each other, and thus the only option for Mario was to run away.

With the help of Shadow Siren Vivian, who was currently in Twilight Town looking for the Superbombomb and did not recognize him, the actual Mario heard from a Crow in the village that a being in the basement of the Creepy Steeple would know Doopliss's name. Back in the steeple, they heard about the name "Doopliss" from the parrot living there. However, the the lower-case letter P was not available in the name selection screen provided by Doopliss, so they had to collect and were finally able to name the ghost correctly.

The two cornered Doopliss at the entrance of Twilight Town and told him his real name. Doopliss's magic was, however, not fully broken by this and he fled back to the tower of the Creepy Steeple. In the tower room, Doopliss and Mario's fooled partners fought the actual Mario. Vivian only then realised he was Mario, but chose to abandon her sisters and joined Mario in the fight. Doopliss was defeated and both him and Mario returned to their original forms. Doopliss fled and left back the Ruby Star. While on the run, he met Beldam and Marilyn in Twilight Town, who were currently looking for Vivian at that place.

Doopliss joined the Shadow Sirens and filled in Vivian's place. This meant that he, too, was mistreated by Beldam, who insisted on calling him a "freak in a sheet", despite the fact that he is no longer secretive about his name. He helped the Shadow Sirens at their disruption on the Excess Express. Aptly disguised as the star Zip Toad, he stole the Nitro Honey Syrup from the Ratooey Businessman. This special syrup would cause an enourmous explosion when mixed with calcium and gold. He prepared its use as a bomb, stealing the Shell Earrings of the Toad Waitress for the calcium part and Toodles's Gold Ring for the gold part, but was stopped in last minute by Mario. He was thrown off the train at Riverside Station. Doopliss, Beldam and Marilyn reappeared in Poshley Heights, where they broke into the Poshley Sanctum by smashing a window and stole the Garnet Star, which turned out to be a red herring created by Pennington.

Doopliss reappeared after Chapter 7 in the Rogueport Sewers, where he had taken on the disguise of Professor Frankly and tricked Mario and his partners to open the Thousand-Year Door and go into the Palace of Shadow. The Shadow Sirens and Doopliss fought Mario and company in front of Riddle Tower in the Palace of Shadow. In this battle, Doopliss was a little thougher, and had the ability to transform into one of Mario's partners and attacking as them. After their defeat, Beldam, Marilyn and Doopliss watch Mario's battle against the Shadow Queen.

At the end of the game, Doopliss changes his mind and becomes an actor, being on stage together with Flurrie. He plays the role of Mario (and possibly others) in the play.

Powers and Abilities
Doopliss's major ability is to transform into different persons. By doing this, he can actually steal the real person's look and name, leaving them in a shadow. When Doopliss assumed Mario's form, Mario was unable to tell Vivian his real name, and was only able confirm it when she confronted him with being Mario. Doopliss stated that he could truly become Mario by defeating the original one. However, this is not always the case, as Doopliss is able to tranform into Mario's partners without them losing their own form. This ability is commonly attributed to all Duplighosts.

Doopliss's magic is broken by telling him his name. A crow in Twilight Town states that there always has to be at least one being knowing Doopliss's name; otherwise, he cannot exist. After Mario's victory over him after Chapter 4, Doopliss stops being secretive with his name, however, and apparently, it no longer hurts him when his name is said.

Doopliss somehow enchanted the Creepy Steeple's bell to turn an inhabitant of Twilight Town into a pig each time it rang. It is unknown how exactly he had done it, and it was also never revealed how the curse was lifted. It might have been because of Doopliss's defeat. However, it is more likely that Doopliss himself turned the villagers back to normal, as he, in Mario's form, claimed that it had been him who freed them from the ghost. Also, the bell might still be enchanted, as it is stated that it no longer rings.

When Doopliss corners Mario at the entrance of Twilight Town, he appeares by jumping out of the background, leaving a paperish hole in it. This is never seen at other places, despite the fact that the game has many references to the paper element of "Paper Mario". Later in the game, when Doopliss is part of the Shadow Sirens, he actually has a problem as he is not able to vanish at one spot and appear at another, an ability used by Beldam and Marilyn. Doopliss has to smash a window in the Poshley Sanctum for himself only, and he always runs away alone when the Shadow Sirens have long since disappeared into the shadows, calling them to wait for him.

Trivia

 * Doopliss's name is probably comes from Duplighost, the name of his species, and a corruption of the word dupe (slang term for tricking a person).
 * Doopliss's Japanese name is Ranperu, which translates to Rumpel, which is Doopliss's name in the German, French and Spanish versions of the game, and comes from the fairy tale character Rumpelstiltskin, as both offer the same challenge: to have another guess his name.