My old username, Yami Yami chan originates from the one and only To Love ru character Yami, and I was thinking of a name for my Xbox Live account years back. And apparently I thought of that and it was the best decision of my life cause everyone would be saying my name saying it's funny or cool or whatever. I would have other versions of this name like just Yami or what I use a lot more recently Yamisu~ which is a kind of a slang in Japanese where you would say your name and add "su" at the end of your name. In english it would kinda sound like someone sayings "name" here! or something like that.
Then I had depression and bunch of other garbage and changed my name to Disappear, not only liking HD at the time but how I felt at the time. Now Disappear has been another username I use to this day for other things. So I kinda switch between Yamisu, Yami Yami chan, and Disappear.