hmm this is an interesting topic. I'll do my own write up and it'll be big so here goes
BORNEO
Heroes: Colleen, Gervase, Gretchen, Rudy
Villains: Richard, Kelly, Sue, Jenna
AUSTRALIA
Heroes: Colby, Elisabeth, Rodger, Mike
Villains: Tina, Keith, Amber, Jerri, Alicia
AFRICA
Heroes: Ethan, Big Tom, Teresa
Villains: Lex, Brandon, Kelly G, Lindsey
MARQUESAS
Heroes: Neleh, Kathy, Paschal
Villains: Sean, John, Rob
THAILAND
Heroes: Jan, Jake, Ken
Villains: Brian, Clay, Helen, Ted, Penny, Shii Ann
AMAZON
Heroes: Christy
Villains: Jenna, Rob, Heidi, Deena
PEARL ISLANDS
Heroes: Rupert, Sandra
Villains: Jonny Fairplay, Burton, Christa
VANUATU
Heroes: Eliza, Sarge
Villains: Chris, Twila, Ami
PALAU
Heroes: Tom, Ian, Stephenie, Bobby Jon
Villains: Katie, Coby
GUATEMALA
Heroes: Danni, Lydia, Brandon, Amy
Villains: Rafe, Judd, Jamie
EXILE ISLAND
Heroes: Aras, Cirie, Sally
Villains: Terry, Shane, Courtney
COOK ISLANDS
Heroes: Yul, Ozzy, Candice
Villains: Parvati, Jonathan
FIJI
Heroes: Earl, Yau-Man, Michelle
Villains: Dreamz, Stacy
CHINA
Heroes: Peih-Gee, Erik, James
Villains: Todd, Courtney, Jean-Robert
GABON
Heroes: Sugar, Matty, Crystal
Villains: Kenny, Corrine, Randy
TOCANTINS
Heroes: JT, Erinn, Taj, Brendan
Villains: Coach
SAMOA
Heroes: Natalie
Villains: Russell
Alright, those are all the people I'd seriously consider from each season for each role. Some are a bit of a stretch but I tried to pick everyone I'd consider even a little. As for My person official cast, here goes:
HEROES
Men: Rudy, Colby, Rupert, Aras, Yau-Man
Women: Elisabeth, Kathy, Sandra, Stephenie, Cirie
VILLAINS
Men: Richard, Rob M, Brian, Jonny Fairplay, Russell
Women: Sue, Jerri, Kelly G, Jenna M, Ami
I think that cast would lead to a very interesting season