π is one of the oldest accounts on RationalWiki, having been around since 2008, but has been mostly inactive since late 2015. Started editing in 2009. Created Pibot, an archiving bot which was eventually deactivated and essentially remade as Archivist by FuzzyCatPotato. Also made a ton of other now inactive bots that nobody cared about.
π has 30 items on their to-do-list.