Princess Jemmy is the offspring of the Overgod Chaos and is considered one of The Four who rule in Pandemonium. She's a representative of pure change and chaos in certain natures (and especially those of humankind and godkind). She stands about 3'11" and weighs about 50 pounds; she is often seen carrying around a balloon.
Dogma
As a representative deity, Princess Jemmy isn't one for the purpose of religion nor -really- any true purpose known to mortalkind. Those who've chosen her as patron usually belong to the League of Chaos - a mortalkind sect of Warp practitioners who are aesthetically affectionate.
Day-to-Day Activities
Those who belong to the League of Chaos spend their time normally despite any situation … except that they're often found scheming or attempting to undermine their adversaries (The Order) in an ongoing civil-war that few mortalkind understand. Whether their interests are in politics, sciences, arts, war, et cetera - and despite whether or not they are considered moralistic or not, IF they bare the Dancer Silhouette tattoo of Princess Jemmy - they're always inclined in a bias against the Order which they can usually never explain.
Holy Days / Important Ceremonies
None. There's no order to the workings of this Deity, what were you thinking?