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.
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.
-------------------- On Pixel Art Requests: I generally do not accept work unless I either have the time, if I see your project worth my time to contribute towards, and that is usually me doing the approaching to you on that.
-I also do not accept speculative work as I do have various art I made on-hand with me.
-I am more receptive to equivalent exchange of resources in which case, you can DM me wherever I have an active presence on for the details.
-Other times I'm availible for your project is C3 request threads I may run.