These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Crowning Level Of Awesome: In Original Generation Gaiden, Mizal brings out hordes of Bartolls instead of regular Shura Mecha-Mooks, making his level the only levelLamia Loveless can have her vengeance against the Bartolls. Pretty much the only satisfying thing Mizal could ever provide to players when he's alive (the other being the player killing him, which incidentally, he provides in the very same level.
Game Breaker: Ialdabaoth's nigh untouchable with high damage output...and that's not even before casting the Focus Spirit Command.