I recognize a few on 4chan
>Anti Half Life poster on /v/
This guy makes hundreds of posts a day demanding people stop enjoying half life. He has a folder of fifteen year old screenshots from rpgcodex of people saying they don't like half life. He's so obsessed that he makes threads about half life just to talk to hmself in.
Wannabe mathematician and physicist who's notorious for Francis E Dec style mass mailing campaigns of his schizo papers on disproving the Riemann Hypothesis and various topics in physics. He claims to be the target of a massive conspiracy by his mother to get him kicked out of college for molesting people, which is totally cool in his book bickers he just so happens to be the reincarnation of God himself. If you talk to him long enough he devolves into rambling about endless torture and genocide he plans to inflict on detractors once he's recognized as god.
One of the more entertaining /sci/ cranks. At his peak he was making hundreds of threads a week on /sci/, /v/, /pol/, and /adv/ screaming about 5G. His antics are too lengthy to contain in one post, so /sci/ helpfully came up with a pastebin to post whenever he shows up
>Frank H Slauenwhite
Tripfagged under the name "Anonymous5" on /pol/. Starting in 2016 until he was permabanned in 2019, he'd make thousands of vague posts a week about how he's a deep state insider. He could be recognized by his atrocious grammar and overuse of apostrophes which resulted in his identification as scrinrusher/antasaur/frank36X and subsequently his IRL dox. He attracted a dedicated band of shitposters who would derail his threads with spam and shoops, which would make Frank and his retard followers sperg out and mass report everyone in the thread. His eternal asshurt only intensified when Qanon showed up with the same gimmick and got infinitely more success than Frank could ever hope for. Even the gullible normalfags at /pol/ eventually realized he was full of shit, and his supporters dwindled to ten or so dedicated schizos who RP'd as detectives and tried to bust the satanic pedophile conspiracy by putting polka dots on maps and posting pictures of warehouses.
Underage spammer from the most ghetto part of Las Vegas who hated his mom's Pontiac so much that he spent years spamming /o/ with copypasta about how much GM sucks. He'd occasionally get in slapfights with other spammers and fill threads to bump limit with inane garbage. He eventually grew up or died or something, bickers I don't see him around any more.
JIM PROFIT JIM PROFIT JIM PROFIT
There's probably more of these people on /v/ than anywhere else