Sayaka Maizono is the deuteragonist of the first half of the first arc of the Nisekoi.

No, she's a character in Dangan Ronpa.

No Gio, she's from Danganronpa buddy, I'm not sure what type of weird story you're trying to build here but please do not spread misinformation

Giovannifelix is a schizo that makes up random bullshit. You can see him repeatedly try to inject his headcannon into various fandom pages, and he even created a fandom page for a non-existant game that stars Marie Rose and Honoka from DOA. He should be banned.