"magic" was the word I used most when I was little, to describe something as good, cool, great, etc. It's never gone and I still use the word "magic" in the same context.
DH has a name for me which part of it is "Mynx". He's called me that name since we first got together, usually in slushy text messages, that kind of thing, so I started using Mynx in usernames. I usually don't use the same username on more than one forum though.