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.
YMMV: Kingdom Of Paradise
Complete Monster: Densei. Not only does he cause the destruction of a clan - his own, for that matter - he kills his own adoptive father, whose destructive actions as the big bad are revealed to be acts of love and desperation to keep Densei by his side, ruling as father and son.
Nightmare Fuel: The Toshintetsu, especially because the long-term fates of the souls trapped inside are not openly explored. We don't know if they are aware of their suffering, helpless, forced to provide insight from the terrible machine.
Honestly, the premise of The Glory Festival and Seima technology is sufficient nightmare fuel.