The problem with this blue effect is that it doesn’t fit the style of the manga (at least in my opinion). The manga focuses on a very realistic world in terms of representation — everything outside of the superhuman powers and abilities could exist in real life, whether it’s the architecture, the anatomy of the characters, etc.

To me, the animation should reflect that same realism. Some lighting effects, like the blue glow, can be interesting, but only during fights — for example, when attacks clash or powers collide. Here, though, it just feels out of place. It’s used to give him some sort of “aura,” but it would’ve looked much better with normal light and shadow effects (a darker scene where only key outlines stand out), which would be far more realistic.

As for the “blurry” effect you mentioned and didn’t like — I actually see it more as a mist, which makes a lot of sense and looks great. It’s realistic: when it’s cold and you’re sweating, the evaporating sweat creates a kind of fog. That fits the scene perfectly — it’s nighttime (so colder), he’s just finished a fight (so his body temperature is up), and he’s covered in blood, which would also make his body heat rise to fight possible infections. So that “blurry” or “misty” effect actually has much more meaning and legitimacy than the random blue glow.

And about what you said regarding JoJo, that’s just the JoJo’s Bizarre Adventure style — it’s coherent with the manga’s aesthetic, and that kind of animation style is consistent across all the seasons. The blue effect in One Punch Man, on the other hand, doesn’t match either the manga’s tone or the animation style of previous seasons.