Curious question and a good one.

We are inclined to leave this up to you. Because it's an event and a special occasion, it's possible that ability might fail for some reason, if you wanted it to for the sake of being able to play Dazai as branded.

If you are more inclined to sign up with a different character, we would encourage that. Whatever would strike your fancy and what you think would be feasible per your characters is what we would want to nurture.