Old hacker culture, no, current hacker culture, yes. Anime themed ricing of Linux distros is extremely common, there are probably more anime profile pictures than not in some communities I hang out in
I guess I don't consider "ricing" your Linux distro as hacker culture. The people I knew from college CS courses who did that almost entirely spent more time tweaking themes than hacking(based on their success in the CS program). I see far more anime avatars associated with anti-social Twitter trolls rather than actual hackers.