I tweaked the last two rounds a little because I realized they would kind of be the same thing.
Okay Round 3!
Anyway:
Round 1: Protagonist- Rapunzel
Round 2: Protagonist's best friend/deuteragonist- Anna
Round 3: Main Villain- Tiana
Round 4: Villain's minion
Round 5: "Tough Girl"
Round 6: Protagonist's rival.
Round 7: Tritagonist (Third most important character)
Round 8: Major Character who dies
Round 9: Good person turned evil
Round 10: Protagonist's Dead Family member
Round 11: Annoying Popular Girl From before Events
Round 12: The comic relief
Remaining 13th will be a minor character with a big role.

Bonus Round: Protagonist's love interest

Probably. Elsa has a hard time standing up for herself, and is more likely to do another person's bidding.

Elsa will be Tiana's Darth Vader or Kylo Ren. She's the one who has the powers. You know, physically strong but mentally and emotionally weak. Fits my main villain's minion ideal! ^_^

This role posibbly the great one for her.

The stupid one who got tricked by the villain. Similar to her role in original film, only this time no daddy to save her and she becomes the villain's minion.

^Wait, what? Ariel's dad didn't save her. Eric did. Triton traded his crown and became Ursula's "minion," too --- because Triton was effectively "tricked" as well. So being stupid doesn't mean just Ariel. Her dad was tricked, too.

As for Elsa, NOBODY tricked her at all, but they LIED to her. And Elsa could have, at any point in the movie--- stood up to Hans. But she didn't. So, Ariel is stupid for believing in someone evil. But Elsa is a coward for knowing she caused the ice storm, and then not taking care of it or Hans. So it's not the same thing.

^What I mean is that Ariel will be instantly turned into Ursula's minion if her dad doesn't come, right? Besides, Ariel deserved to be turned into the villain's minion since it's because of her selfishness she fell into Ursula's snare. Her dad got tricked because he loves his daughter very much. Very contrast, isn't it?

Fine, you can say Elsa is a coward, she did all of her mistakes because she's afraid she will make things worse (clearly in the movie that fear is her biggest enemy). She thought that she's a threat to Arendelle if she's there. Yet, every mistakes she has created are not because of her selfishness like Ariel did. But since Elsa is already the villain's minion according to this full-of-Elsa-haters-spot countdown, she is a redeemable villain's minion, (just like 3xZ said "Darth Vader").