BLaCkPoWeR peaked during the 4 era, when all the Bey stans thought he was a lunatic (me included).
However, his peak isn't big enough to qualify for 'has-been' status.
He could have became a Legend like Jafet if he would have just continued to be himself
but now that he has fallen in line with everyone else him is just the one retard clone in the bunch.
Nicole, Vin and satellites are probably three of the most memorable members on this site though. And all the Gaga fans mentioned so far will forever be relevant; Little Legends are just too iconic to become hasbeens.