As miki and variations of it seem to be very common (nick)names, I've had to use several of them myself in various sites. It is very likely that someone using name "miki" is not me (unless it's on some obscure train/aviation site), and conversely, "01miki10" is probably me, except in Twitch, where it was already registered by some another.

Most sites where I have an account (and don't use my own name) are listed in the table below.