I'm enjoying this a lot but have no 5 star characters and three 4 stars characters. I linked my account before realizing what that meant. Is there any meat to re-roll at this point?
You can unlink the account in game but it also deletes the save. Maybe reroll on another device or emulator with an unlinked save until you find something you want to commit to. Then just unlink your Nintendo account in game, link it to the new save, and link it again on the device you want to keep playing on.