No, I don't think they are "legends", just some posters (or one and the same under different aliases) who are too afraid to post under their real name and preferred to use a nick instead.
They perhaps might think that they are important. But they are not!

What's wrong with being afraid to post under your own name, Mr Carry? Well,(and I know who you are haha) certainly LondonGirl offered an embarrassment of ID as to whom she is- we have also seen her picture on facebook. I think actually there a lot in denial because she is a female- a lot of wounded pride that a female out-argued more or less every-body-every man. Yes, I could be called Nick, who knws- but the thing is with me is if my name and exact whereabouts was hung up in lights it would not be a disaster, en fin pour moi. All good fun though hahaha