Who would be the main protagonists, supporting characters and main villains? :LUL
I'll start with the 2015 and 2016-18 eras:
Prequel: Shinden Reborn/Frankie Shinden:
Main protagonists: GridZero (anti-villain), Frankie (anti-villain), Yoshi (anti-hero)
Main antagonist: P123, Yoshi, Frankie...