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Hosts
Toad
- Voiced By: Tyler Donnay (2013 - 2016), Ryan Shields (2018 - present)
Bobei
- Voiced By: Tyler Donnay (2013 - 2016), Mike Herrera (2018 - present)
- Ascended Extra: Originally planned to be a one-off intern who would die in the first episode, the creators found him so amusing they decided to keep him as a Running Gag. Eventually, he would become Head Intern and nearly Toad's Co-Host.
Toadette
- Voiced By: Melodubs
- Big Bad: Of the Reboot Special after her Flanderization.
- Evil Chef: Becomes this ultimately.
- Flanderization: While she was originally a kind girl with a violent side, she slowly became more and more violent. In the Reboot, she went totally Axe-Crazy.
The Interns
- The Chew Toy: It's impossible for them to appear and survive.
- Killed Off for Real: It's implied that Bobei is the only Intern who is allowed to be resurrected. This is apparently the fate of all the others.
- Red Shirts: Ironically, most are red coated Shy Guys.
Original Contestants
Killer Koopas
Blooper
- The Unintelligible: He only speaks in Bloops. Everyone seems to understand him in the Original. However, he does gain subtitles in the Reboot, though, no one seems to know what he's saying anymore.
Bowser Jr.
- Voiced By: Rhuze (2016 - 2018; singing voice), The Ghostie Zero (2018 - present)
- Expy: Of Ezekiel from Total Drama Island, they both are eliminated early on in every season they compete, are home schooled, and have similar voices.
- Homeschooled Kids: In reference to Ezekiel.
- We Hardly Knew Ye: Being the first voted off of the original and ultimately placing last in the reboot.
Donkey Kong
- Voiced By: Paul Hikari
- Butt-Monkey
- Iron Butt Monkey: He never stays dead, ever.
- The Chew Toy
- He's Back!: In the reboot after the merge.
- They Killed Kenny
- We Hardly Knew Ye: In the Reboot, he's the first out.
- Your Size May Vary: He's appeared as the same size as Bowser before, while others he's as tall as Mario.
Iggy Koopa
- Voiced By: Luigi Fan 00001
Lemmy Koopa
- Voiced By: Viva Becker ( 2014 - 2018; singing voice) Alyssa Kay (2018 - present)
Ludwig Von Koopa
- Voiced By:
- Evil Genius: Among the Koopalings and Bowser's minions, he's easily the most intelligent.
Luigi
- Voiced By: Krowe Yin Feathers
- Flat Character: In season 1, his only major characteristic was his lack of ANY personality.
- He's Back!: In the reboot after the merge.
Princess Daisy
- Voiced By: Christine Johnson (2013 - 2015), Chibi Pandah (2016), Abigail Turner (2018 - present)
- Bandage Mummy: Becomes this after being mauled by a bear in the original.
- Bears Are Bad News: Being the cause of her elimination, yes, yes they are.
- The Ditz
- Larynx Dissonance: Like all the other girls, she was played by a male.
Princess Peach
- Voiced By: Trina Deuhart
- Only Sane Man: Often the case, though Steve is this as well.
- Larynx Dissonance: Like all the other girls, she was played by a male.
Petey Piranha
- Voiced By: Tyler Donnay
- Big Eater: Especially when there's tater tots, carrots, or chimichangas around.
- Cloud Cuckoolander
- The Ditz: More of a Ralph Wiggum but considering the trope's deletion, this one will do.
Roy Koopa
- Voiced By: Paul Hikari
Sheldon
- Expy: Of Toadsworth after his model couldn't be found in Garry's Mod.
Steve
- Voiced By: Maks Dudek VA (2016 - 2018; singing voice), Zackery Stevens (2018 - present)
- Defrosting Ice Queen: In the reboot, Daisy grows on him, causing him to be less grumpy, and the two become a couple.
- Only Sane Man
Yoshi
- Voiced By: Tyler Donnay (2013 - 2015), Eyesof Estranged 15 (2016)
- Big Eater: Focused on more in the Reboot, where it actually causes his elimination
- Flanderization: While he was initially just afraid of Birdo, as time went on Yoshi's entire personality became his fear of Birdo's sexual advances.
- Overly-Long Tongue: As is a staple for his character.
Screaming Shy Guys
Birdo
- Voiced By: Kyle Wilson
- Abhorrent Admirer: To Yoshi.
- Single-Target Sexuality: He only seems to be attracted to Yoshi.
Boo
- Voiced By: Melodubs
- Larynx Dissonance
- Nice Girl
- Overly-Long Tongue: Mentioned many times but never really shown.
Bowser
- Voiced By: Tyler Donnay (2013 - 2015), Super Mario Movie Maker (2016 - present)
- Anti-Villain: Despite doing lots of bad things, Bowser seems to have a nice heart.
- Breath Weapon: Comes to use for is team in many occasions.
- Fat Bastard: A Running Gag in the series is how fat Bowser is.
- Jerk with a Heart of Gold
- Villainous Crush: With Peach of course.
Diddy Kong
Dry Bones
- Voiced By: AJ Winter
E. Gadd
- Flat Character: He's smart and Ludwig's rival. That's it.
- Nerd Glasses
Larry Koopa
- Voiced By: Lindz Steindler
Mario
- Karma Houdini: Considering the first two show's early cancellations, Mario has never received his comeuppance.
- Large Ham: In the Original, but totally removed in the reboot.
- Manipulative Bastard: Tends to be how he gets his way.
- Narcissist: In the Reboot special he refers to himself as the "Most Beloved Video Game Character of All Time". This may very well be true, but the point still stands.
- Red Is Heroic: Averted.
- Schemer
- You Have Outlived Your Usefulness: To Toadsworth and E. Gadd in the Original.
Morton Koopa Jr.
Toadsworth
Trooper
- Single-Target Sexuality: To Bowser.
Waluigi
Wario
Wendy O. Koopa
- Daddy's Little Villain: The only female Koopaling.
- Larynx Dissonance: Like all the other girls, she was played by a male.
Reboot Newbies
Diddy Kong
Sheldon