So, I am copying something from TV tropes below called "Mohs Scale of Violence Hardness" which is they use to show how gruesome a work is.
7. Blood splatters/spurts start to become noticeable. Mild gore may be seen. Onscreen acts of mutilation of bare flesh by bullets or blades generally start here. Mostly bloodless but onscreen (clothed) genital trauma may appear. Mildly or cartoonishly bloody decapitations start here. Mild obliteration or "gibbing" (little to no graphic/discernable body parts) may appear. Graphically and gorily burnt skin starts to show up on this level. Onscreen rape will always rate at least a level 7.
8. Explicit and/or particularly large, but not comedic, blood squibs, spurts, and splatters are a frequent sight. Perhaps some moderate gore can be seen. Such as a moderately graphic (realistically spurting blood) dismemberment, decapitation and/or head explosion (maybe a not-too-graphic, semi head obliteration, if brief or out of focus enough) and somewhat bloody, but not explicit genital trauma may appear.
9. Gore really starts becoming common here. Exposed organs, bone, or muscle may be seen briefly. Bloodily exploding body parts really start showing up. Graphic semi-obliterated/decapitated heads appear here.
10. Gorefest territory. Nightmarish depictions of bodily harm such as being reduced to pulp, skinned corpses, explicitly mutilated genitals, etc. show up here, as do realistic, prolonged, brutal sequences of genuinely gory mayhem. The very hardest of hard-R and even NC-17 make their appearances on this level. Real-world graphic violence (within fictional context) and on-screen graphic/gory scenes involving children reach this level.
Kimetsu no Yaiba is in the 7-8 territory. I don't know if chainsaw man and some others will be higher though given the description of 10, I don't think any WSJ series will pass 9.
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