Okay, after reading all your reviews, I have determined the final roster. And they are:
SCREAMING GOPHERS (MY PICKS)
Benson from Regular Show
Cinder Fall from RWBY
Finn from Adventure Time
Mabel Pines from Gravity Falls
Max from Camp Camp
Nate/Keita from Yo-Kai Watch
Sandy Cheeks from SpongeBob Squarepants
Star Butterfly from Star Vs. The Forces Of Evil
Tails from Sonic X
Yellow Guy from Don't Hug Me I'm Scared
KILLER BASS (YOUR PICKS)
Cammy from Street Fighter
Dib from Invader Zim
Grizzly from We Bare Bears
Jack Atlas from Yu-Gi-Oh 5D
Lapis Lazuli from Steven Universe
Lola from The Loud House
Luke Cage from Ultimate Spider-Man
Marinette from Miraculous Ladybug
Mordecai from Regular Show
Peridot from Steven Universe
Rainbow Dash from My Little Pony: Equestrian Girls
Now, while I may have made final selections, I did say it was going to be different from other Total Drama fanfiction (details in the first chapter), so here's how I'll write the story.
The first part I'm going to do is simulate the Total Drama Island format using all the characters. Once I got screenshots of everything and I know the elimination order of this FanFiction, I'm going to start planning on some character arcs (as in who will play an antagonist role and who will play a protagonist role, etc.) as well as knowing how much research I have to do on some characters that I have unfamiliar with.
After all that, I will start working on a Story Outline/Episode and then will start writing the chapters.
As a result, the first actual chapter won't suddenly appear tomorrow or within the next few days. I'm not going to rush this and I want to flesh out the characters without making it seemed half-assed.
So, thanks for the suggestions and hope RNG is on your side. I want to make this one of the most well-written Total Drama Fanfics on this site so having a plan will help.
The next chapter will be the beginning of the Fanfic. So don't worry.