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: Hatenkou Yuugi
Badass Decay: Alzeid, because he never bothers to train. He starts worrying about it later in the manga.
The author even refers to volume 9 as "Alzeid's parade of incompetence" and mentions how he'll be even more of a loser in future volumes.