Mike's alternate personalities

Mike admits in the Confession Cam that he has Multiple Personality Disorder in Ice Ice Baby, but he has been shifting into other personalities since Bigger! Badder! Brutal-er!. Mike is aware of his alternate personalities but says he cannot control them. He is able to talk to them but they may or may not listen to him, and seems to not remember anything when another personality takes over. His personalities also appear to dislike each other as seen in Backstabbers Ahoy!. Mike tells all of the other contestants that his personalities are part of a comedy routine that he practices, because he does not want anyone to know the truth. When one of Mike's other personalities take over, he takes in a big gulp of air before the said personality takes over. Mike finally overcomes his Multiple Personality Disorder in Grand Chef Auto after winning a fight against them in his mind.

Mike
He is the main personality. Mike is somewhat shy and fearful of having the truth of his multiple personality disorder being revealed.

More information on Mike.

Chester
Chester is the first personality seen on Total Drama: Revenge of the Island. He debuted in Bigger! Badder! Brutal-er! when the team was trying to cut down the totem pole. Chester is a grumpy old man who has a hunched back, a wrinkled face, one eye shut, and complains about the youth of today.

Chester was also seen in Truth or Laser Shark. While he was sleeping, he began fussing over the youth and going back and forth from Chester to Mike. Chester appeared when Mike was accidentally hit with a spoon in Ice Ice Baby. He was annoyed and said people used to eat with their hands. In Backstabbers Ahoy!, Chester is shown in the beginning of the episode while Mike is asleep saying how his other personalities are "punks."

In Runaway Model, Chester appears and complains that Anne Maria and Zoey were making Jo's make-up too complicated, and that they just needed to "add a bit of rouge." He proceeded to apply the make-up on her himself, but ended up making Jo unbelievably ugly. Jo later found out and threw barrels at Mike, while calling him Chester, to which Mike had no idea of what he had done.

Chester also makes a few appearances in The Treasure Island of Dr. McLean. First he appears in a flashback where it's explained that Mike turns into Chester whenever he gets frustrated Mike stubs his foot on a rock, causing him to change into Chester and kick the rock, which just hurts him more. The second time is when the Mutant Maggots are rowing back to shore, and the team falls into disarray, frustrating Mike to the point of turning into Chester.

Svetlana
Svetlana is a Russian gymnast that debuts in Truth or Laser Shark. Speaking in a Russian accent and in third person, she has: long eyelashes, thick lips, and a graceful figure. She appears proud and confident in her skills whenever she appears. Jo compliments her on her athletic skills. Svetlana also appears in the theme song, performing acrobatics in front of Zoey. She first appears during the second challenge of Truth or Laser Shark. When Mike starts giving himself a pep talk, he changes to Svetlana, who finishes Mike's part of the relay with ease.

In Ice Ice Baby, Cameron purposefully tries to get Mike to change to Svetlana because of her great athletic skill by calling her up to perform. It works, and Svetlana launches herself towards the Rats' fortress. In Finders Creepers, Mike changes to Svetlana in order to save the other contestants from the spider.

Svetlana makes a brief appearance in The Treasure Island of Dr. McLean, first time being in a flashback, and the second being when Mike is climbing a tree, and begins struggling. After landing (with perfect form), he changes back to Mike in order to rescue Zoey. Svetlana is the only one of Mike's alternate personalities he has ever tried to change to on purpose.

Vito
Vito is a tough and aggressive man that debuts in Ice Ice Baby. He seems to enjoy picking fights and flirting. Vito also seems a little clueless and lazy at times as seen in Finders Creepers.

This personality likes Anne Maria, as shown throughout the show. He is muscular, usually shirtless, and has hair that is gelled back. Vito, just like Anne Maria, is based on the Jersey stereotype. This attraction is disapproved of by Mike and has subsequently caused a love triangle between himself, Zoey, and Anne Maria.

The first mention of Vito was in Anne Maria's Total Drama Online biography, where she mentioned that her dream date would be with Vito. Mike is shown to not like Vito because he is harder to control than Svetlana and Chester. Unlike the actual scenario, Anne Maria believes Vito is the real personality and Mike is the real "act." Whenever Vito appears "Duncan's theme" is played.

Manitoba Smith
Manitoba Smith makes his first appearance in A Mine Is a Terrible Thing to Waste. He has a thick Australian accent and is able to track what is nearby just by observing the ground. He is fairly cocky and quick to take charge, but is also quite witty. He is hinted to be rather sexist, saying that the mine carts would be too dangerous for girls (which noticeably upset both Zoey and Anne Maria). This personality is triggered by him wearing a fedora.

His next appearance was a brief one at the beginning of The Treasure Island of Dr. McLean when Mike puts on a fedora. However, Cameron quickly removes the hat, changing Mike back to his normal self. He is a parody of Indiana Jones, although his accent parodies both "Crocodile" Dundee and the late Steve Irwin.

Trivia

 * Whenever Mike is about to change personality, he breathes in deeply and bulges his eyes.
 * Cameron, Dawn, Chris and Scott are currently the only people on the show to know of Mike's multiple personalities.
 * Cameron asked Mike how he was able to do well during the obstacle course in Truth or Laser Shark and seemed suspicious of him when he did not give a straight answer. In Ice Ice Baby, he noticed that Mike said personalities accidentally and tried to bring out Svetlana by making a grand announcement. In Backstabbers Ahoy!, Cameron reveals in the confessional that he has been recording Mike's personalities because they are interesting. In A Mine Is a Terrible Thing to Waste, he tells Mike that he can help him control his different personalities.
 * Dawn realizes it through an aura reading, picking out different ones for his different personalities. This is demonstrated when she specifically tells Zoey that the "Mike parts" of his aura love her.
 * Chris may have known before hand or just by watching the Confession Cam videos.
 * Scott was accidently told by Cameron that Mike has Multiple Personality Disorder, when Scott suspected Mike was hiding something.
 * Each time Svetlana appears, similar music to when Owen climbs the waterfall in The Big Sleep and when Owen uses himself as a human cannonball in Sweden Sour is played.
 * Zoey has noticed these alternate personalities, but she assumes that it is some sort of comedy routine.
 * Mike often acts as if they are a comedy routine as he does not want anyone else to know about him having multiple personalities.
 * Anne Maria believes that Mike only pretends to act as he normally does, and whenever the two are alone, Mike returns to who Anne Maria thinks that he actually is, Vito.
 * Ice Ice Baby is the first and only episode of the fourth season in which the order the personalities came in were the same order they debuted in.
 * Vito may be a homage to Jersey Shore cast-member Michael "The Situation" Sorrentino, thus possibly explaining Anne Maria's interest in him.
 * Chester is currently the only personality that no other contestant seems to like.
 * According to the Total Drama Panel at Fan Expo 2011, Svetlana was originally Swedish, Vito was called Vince, and Manitoba Smith was called Manitoba Mike.
 * Mike is able to change personalities through certain events:
 * Mike: Whenever Zoey is in trouble.
 * Chester: When Mike gets injured or complains about something.
 * Svetlana: When Mike is determined to get something done or when someone mentions the Olympics.
 * Vito: Whenever Mike loses his shirt or is alone with Anne Maria.
 * Manitoba Smith: Whenever Mike puts on a fedora or somebody puts it on his head.
 * However, Mike is able to change to his alternate personalites in his sleep without the requirements.
 * So far, all of Mike's personalities are hinted at in his biography.
 * Manitoba Smith parodies Indiana Jones, as both of their first names are the names of locations, along with the fact that Indiana Jones's name was originally Indiana Smith.
 * Manitoba Smith is the only personality to have a full name.
 * In Mike's biography, it is mentioned that Manitoba Smith is married.
 * Svetlana is Mike's only female alternate personality.
 * Mantoba Smith seems to call women "Sheila," which is Australian for girl or woman.