I spent a while thinking of a username after I changed from my initial account username, Lettursnnumburs. I wanted my name to sound somewhat Japanese considering back then, on PC, Japanese oriented usernames with common English characters was the main thing going around.
It took a long time before I finally decided, like I normally do, on the first letter. I decided on P just because the first word that came to my mind was Patch. Inspiration for my first name in my username came from Patchou, the creator and developer of the popular MSN Messenger add-on, Messenger Plus! Live. Usually, whenever I try to make a new username, I base it off of one creating and since Patchou was the first to come to mind, I decided to go on with that.
I forget where the "is" in Patchisou came from, but that doesn't seem to be important.
Same goes for the "Yu" in Yutohru. I just know that Tohru came from Tohru Honda from Fruits Basket, which was my current favorite anime until the time I became involved in watching Kiba and Death Note, which replaced Fruits Basket as my favorite anime quickly.
My username is pronounced Patch-ee-sue You-toe-roo, for those who are interested in knowing. Since people can't seem to say it out loud and butcher it in Skype conversations absolutely all the time.
But I change my username whenever I get the chance (and yet, I keep coming back to Patchisou Yutohru between every other name change), so this will continue to be my username for another month's time and then I'll be known as something different.