I completely loathe anime with every cell of my body, so you'll never catch me with an avatar like that, but I do understand why many people have them. A lot of video game fans simply also like anime. I'm not sure why there's such a strong overlap (I guess because video games and anime are both often lumped together as "nerdy" things?), but there is an overlap nonetheless.
Also, the difference between the anime "style" of illustration and most other types of drawing and illustration is that characters in anime tend to have more realistic proportions than other cartoons (there exist exceptions of course), making anime characters feel more "attractive" than many other exaggerated styles of cartoon drawings. It makes sense that such characters should appeal to people more.
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I hardly use anime pfps but I like the artstyle nonetheless.
And yes I agree there are overlaps between the anime community and the gaming community.
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I'd say there's an anime that resonates with everybody (whether you can find it is a different story). It's just japanese animation, and there's tons of art styles and plots.
More modern anime has perfected the kinda pop-culture niche comics and such have settled in. So you get that. It's kinda like asking "why are there so many memes?", it's a pop-culture niche and certain groups have a core membership in that niche. Like everyone else said: nerds are one of the core members.
(fwiw I "hate" creepypasta/memes/YTP/etc. and being generationaly associated with it. I feel we did it in moderation but "little kids looking up to big kids" and "parents being hip" kinda overdid it to the point where much of it is a cringefest to me)