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.
Fridge Brilliance - On the Japanese cover, you see Yohn embracing Kyril. Turns out she's his mom.
Game Breaker - Hello, Lazlo! What have you done to that True Rune of yours? Oh, you've taken away the life-draining effect that was its only weakness and now it heals you while you kill things with it instead? No, that's not ludicrously overpowered at all! Not to mention Lazlo is treated as a plotline character despite only being a guest star with no plot impact, and thus can't permanently die if dropped to zero HP. And has good physical attacks and combination attacks on top of his overpowered rune.