I only ever lurked on P.ie but the only poster I can remember by name is Cruimh, because he was so awful. What fascinates me about his name is that it means 'maggot' in Irish, and that the neologism 'cruimhthireach' (or cruifearach) is used for 'Presbyterian' in Ernest Blythe's Irish language writings (from cruimhthír, 'presbyter'). Cruimh was an Ulster Protestant I think, perhaps a Presbyterian, and a dreadful poster. If an Irish language novelist included a Presbyterian character who was lower than a worm, calling the character 'Cruimh' would be an act of Dickensian brilliance, and yet this fellow called himself this. Very strange!