NYCMM definitely belongs here. Pretty sure he's still kicking around on Discord as well. Other ones that come to mind from my time are King Lear and that R-CA guy who said Rs would sweep the House in 2018. Pretty sure I remember a particularly bad R-PA getting banned too. And of course there was Texarkana, the reason I still have signatures disabled to this day.
He's also occasionally popped up at Atlas After Dark, from what I've seen. NYCMM was an absolutely bizarre user, with his electoral predictions being "overly optimistic"-if one wants to phrase them as such-for Trump and Republicans, with his strange insinuations about other users, and his constant boasts about his own achievements. And King Lear did nothing but spam the electoral boards with his trollish and nonsensical takes.