Who is the main character in Twilight?

Isabella Swan and Edward Cullen.
Main: Bella, Jacob, Edward, Alice, Emmett, Jasper, Esme, Carlisle, Rosalie, Charlie, Renesmee

other characters:

Renee, Jessica, Mike, Angela, Ben, Eric, Tyler, Billy, Jared, Paul, Sam, Emily, Leah, Seth, Collin, Brady, Tanya, Kate, Eleazer, Irina, Bree, Garret, Laurant, James, Victoria, Vladimir, Stefan, Peter, Charlotte, Maggie, Mary, Kebi, Tia, Alistair, Amun, Aro, Caius, Demetri, Jane, Alec, Felix, Siobhan, Liam, Zafrina, Kachiri, Senna, Quil, Embry, Sue, Harry, Phil, Chelsea, Marcus, Fred, Diego, Riley etc.

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The main character is one person, Bella,

Isabella Marie Swan, but in Breaking Dawn, she married Edward Cullen, so her nme became Isabella Marie Swan Cullen