Name: yin and sin
Label: the twins
Age: 16 (yin),18 (sin)
Looks

Pink one: yin
Brown one: sin
Love interests: Cody (yin), Scott (sin)
Personality
Yin: Yin's big heart and childlike innocence made her one of the most well-liked competitors on the show. Although the other contestants are frequently annoyed by her noticeable lack of intelligence, Lindsay has been shown to only have pure intentions. A major running gag on the show involves her having problems remembering the name of others, even if that person is her boyfriend. At times, such as in Dial M for Merger and Get a Clue, she goes beyond the expectation of her peers and demonstrates that she has the ability to solve problems and likes to be called "Her Hotness" as she does so. She shows herself to be an underdog and hates to be underestimated by her peers, doing her best to defeat them and prove herself. Unfortunately for Lindsay, due to her naïve and gullible nature, she is often tricked by false-friendships and easily manipulated by the show's antagonists.

Sin: sin was one of Total Drama's first antagonists besides heather. Famously manipulative and vicious, Sin knows what she wants and exactly how to get it. Her strategic smarts have proven effective, eliminating a record amount of contestants. She competes with her sights only on the prize money and not on making friends or finding love, using others at her advantage and only being kind when she may ultimately be benefited. This makes it difficult to differentiate her original, mean girl ways from her true heartfelt moments. Such an example is in Total Drama, Drama, Drama, Drama Island, when a tearful Heather tells Harold that she doesn't like "being mean all the time" and it's not fun "being the one everyone hates". Hawaiian Punch, in which she becomes ecstatic at the thought of being the "good guy", confirms that there is at least some truth to her lament. However, even romance is not enough to tame Heather's desire for victory, as shown by her relationship with Alejandro. However, over the course of the series, she has progressively gotten nicer, from trying to warn others about a greater threat, to sympathizing with others, and even feeling awful for accidentally causing someone's life-threatening injuries.

One of Sin's fatal flaws, at least in the beginning of the series, is her vanity. Portraying as a stereotypical rich and spoiled girl, Heather refuses to partake in any activities that may result in ruining her good looks, especially her hair, which earned the ire of one of her biggest rivals, Leshawna. Instead, she had other people do her work for her. One could say that until Lindsay's elimination in That's Off the Chain!, Heather shows little involvement in most of the challenges. This trait has since vanished after season one and she becomes more determined to win challenges by herself.