Long time Downfall Parody fan here!  Didn't actually start MAKING parodies until recently, though.

I'm also a giant sci-fi/fantasy/comic book/anime/tabletop RPG nerd, but from what I've seen in the parodies, we've already got quite a few fellow geeks here. 

Hopefully, I'll make it here!

I'm working on a fanfic that will feature elements from the Downfall parodies. It is a parody of an RP a really eccentric neo-Nazi did with his friend. For more information on this guy (including the RP), see this 8chan thread. It will be set in a world where the Powerpuff Girls helped the Nazis win WWII and will revolve around a young man who finds out that he is Fegelein's son and is destined to become an Antic Master like his father and bring down the Reich with help from Mojo Jojo, who is the leader of the resistance. In the fanfic, the Reich is currently lead by Hitler's adoptive son, an orphaned Russian child who has outlawed potty training and has managed to force the world into diapers (the person who I'm parodying is a diaper fetishist). I intend for this fanfic to be the Asperchu to his Sonichu.