I'm surprised that her return was ever in question.

$10 says that her personality has inexplicably pulled a complete 180, and that she's a happy, chipper, and helpful sidekick with virtually no resemblance to the one-dimensional alpha bitch from last time.

This is not going to happen but I hope Sunset will turn tsundere now. Like "Who would hang out with you losers… but since you insist so much, I will go". What can I say I like Sunset and I like tsunderes… I am a simple man like that ._.