Copy-paste from wikipedia it seems.
Mentioned spambots are still unbanned.
ktura - irrelevant stuff about actors/films/probably something else as well
Harry Potterish - teh water treatment magician.
tamditea - Link spammer.
Michael, PLEASE, sudo somebody to remove the spam. :/
johnu.mmmp - posted a question on a forum asking how to use a forum. Also used an obscene number of question marks.
michal001 - C&P
Marc55Mo is simply copying text from previous posts in replies and always links to images at the end of the post (though the site linked to is now defunct.)