Is there an official form for reporting bugs (or what I think is a bug)?
I'm able to select the same character I'm playing as for CPUs. It's funny, but I don't think it's intentional. I initially discovered it by the random character selector selecting the same custom character.
(Let the Battle Begin!) If two players deal damage at the same time (such as magic) when the boss is near death, one player does not receive double damage while the other does. I assume it's due to the first player (or port priority) not dealing enough damage to cross the damage threshold, but when the second player is checked it is. 
It's still a great game! I really like Let the Battle Begin! I don't know if it's based off of anything but it's based.