I had a long post for this yesterday, but my step father closed the page while I was away from my computer. ;; So here we go... XD
I chose the name Michii because of my real name. Last year, my friends and I used to chill at another friend's house after school every single day. One of those days, I brought my two yearbooks for fun. We would write little tidbits about ours or other people's pictures. One of my friends took my elementary school yearbook and wrote "hai2umichi" on it. I liked the name Michi (as in Mishy), so I tried to change my name to it on the forum that I frequented before I joined PC. It was taken, so I just added an 'i.'
So I'm Michii as in Mishy. Mishy is just short for Michelle, my real name. So I just consider Michii as the online version of my real name, if that makes any sense. XDD;