So, for example..
I was going to pick 'Leafytree' for my username, but that was taken so I had to add 'xox' on the end. (xox means kiss hug kiss)

So what was your username going to be and what did you have to add to get into transformice?

Mikuhatsune

mine was going to be Sadie, but it was taken. you can probably guess what I added on to make it work

My username was going to be Ibuki, and i just added a s at the end

Epifistu

Darkdaydoom But ya it was taken so i just changed the doom to boom

Katito

Youmadbro but someone purposely took it

Harley
Made a variation of the name instead.

Haru, then Haruhi.

I had the thought to use my first name but since it said "nickname", I went with some silly internet nickname that I used to use for everything. Years later I looked up the name on CFM and apparently the account was created the day after I created my first account. I experienced true heartbreak that day.

Olliethekitten but it was too long. I like Olliethekit now though.

Kwakunata. No surprise I got it.

Just Gus

Firerevolt

Accounterrorbot, but couldn't add "bot" at the end.

Berknhiccup .-.

RedCP. Either it was taken or it was one of the accounts I registered before and couldn't remember the password nor email. So I added Mr.

Sadroyals but it was taken omg I thought it'd be original, but then I looked around in my room and wallah, Bunkbeds.

Haybinkunduz