I got my current username from the anime Tokyo Ghoul.
I went to the Tokyo Ghoul wiki and read a bit more about the incomplete kakujas and other stuff, after I've read the first sentence:
''A kakuja (赫者, red one) is a kind of ghoul with a transformed kagune.'' in exact that moment I went to my Osu! profile and changed name because I love the color
red. My osu! skin is bloated with red colors, my computer is red/black theme and most of my clothes are red/black too.
How I got my old username: HaiHaiAnkan.
This was just a random name I choose because I couldn't make up a good name when I made my account.
HaiHaiAnkan directly translated from swedish to english: HelloHelloDuck.
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Edit: I don't even know if Kakuja actually means the red one.. but it still sounds cool