On the second fight, is the health pool fully shared? Meaning if I break the little melody buddies and do super-break-dmg onto them, it affects Sunday as well???
Yes, everytime health is shared across units you can see a chain icon somewhere around their health, for Sunday it's on his own icon since he is a boos
Use S5 After The Charmony Fall instead, it gives just 4% less BE compared to Rappa LC but it would actually be a better since you can benefit from its passive. I only used Rappa LC because i don't have it lol