These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Crowning Moment of Heartwarming: Chapter 13 of Total Drama Chris, where Izzy brings Heather's friend Taylor and mother onstage to support her. Ch 52 has another example, where LeShawna finally buries the hatchet with her abusive former friend Madison, and gets the friend to apolgize for abusing her.
One of the things you may feel sorry for Danielle is how she can't perceive how jerkass she is. LeShawna also becomes one after her past with Madison was revealed.
Mary Sue: During the last part, Katie becomes more of a Mary Sue, always resolving the problems and fighting a pack of giant beavers single-handed with nothing more than a stick.
Moral Event Horizon: Day 7 of TD Chris reveals that LeShawna plastered a very sensitive page of Gwen's diary around the camp to frame Heather and get her eliminated, then plotted with Chris to get rid of everyone who might prove what really happened. To keep Courtney from interfering, she lures her into a hole, planning to let her stay there, injured, until she was safely eliminated.
On Day 8, Justin immediately tops this: he shoots Eva, Cody and Courtney with tranqs, then throws Courtney off a thousand-food cliff onto a concrete slab to complete her 'Fear Multiple' challenge and tries to frame Eva for it. The only remorse they show over this is due to getting caught.
Day 11 sees another MEH crossing when Jewel attempts to frame Heather for murdering Bridgette and Lindsay.
Danielle laces Gwen's drink with truth serum, forcing Gwen to admit her true feelings about Duncan, in front of Courtney. All while she is supposed to be competing in a challenge.
Oh, and Chris is aware of all of these, and 'in' on most of them, courtesy of a little Loophole Abuse of his own.
Ron the Death Eater or Take That, Scrappy!: Owen, depending if you're a fan of the character or not, but it's quite obvious that the author doesn't like Owen much. To recap: He sells his team during the third challenge for jellybeans; he votes Izzy, his girlfriend, for cake, which causes Izzy to dump him and stay angry at him for the whole story, then he votes himself for cake again; during his interview in the aftermath not only he doesn't apologize to Izzy for voting her off but tries to defend and justify his actions, and it's revealed that most of his fans are 6 year old kids who like him because he farts a lot (older fans hate him, and loudly boo him when he's introduced); and lastly, during the last aftermath, after a fan comforted Sadie who was feeling a bit self-conscious about her weight, told Owen that with his obsession with food and constant flatulence was perpetuating the "fat people are gross" stereotype.
Unfortunate Implications: The editors were afraid they'd be accused of this if they left in some of Leshawna's meaner moments from the first season and so selectively edited to make Heather into a full villain to compensate. Heather dryly pointed out the Unfortunate Implications in that too: that it's not okay to make the black girl the villain or at least giving as good as she got, but that it was okay to make the Japanese girl the Big Bad.