Just a suggestion, I dunno how hard/easy it would be, but on the selection screen you have the photos of each character correct? Can you not just include the name in that photo somehow? Or in the battle screen under the charge bars?
I have no idea how hard this may be so im just throwing stuff out there. Also yeh I'd love to know the secret to get to the final boss.
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NIO BUNNY - http://img.imgcake.com/nio/76ayvpngam.png