There are six. I have five, one is still a question mark.suppostedly according to Google AI which I take with an extremely large grain of salt, it is supposed to be for the harpy but that it is supposed to be a question mark as she hasn't been added to the book side quests yet.
... REALLY surprised Google AI is picking up on WCA. Had no idea we reached that far. The secret characters are, in order from left to right
- River
- Harpy
- Cecilia
- Mayyah
- Petra
- Shoo
Though I could have sworn I set all the buttons to be greyed out instead of ? marked if you completed the unlock steps. So if you completed everything, your screen should look like this:
