The "Edo" Period, AKA the "Ancient Japan AU" AKA "The one where Fritz had an ancestor that lived in Japan and was an Oiran" : Basically, During the Tokugawa period there was a ex-concubine named Kessho no Hato that made their own life as a Brothel owner and then he went to live in the Netherlands and basically he is Fritz ancestor. Canon. They have the same shade of blue in the eyes, a mole under the left eye and they are both trans. 
Pshychiatric Ward AU : Where Fritz instead of being sent in jail, he was sent in a psychiatric Asylum. 
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TF2: Basically, "What if Fritz was the BLU medic?"
I wrote a fic with Fritz set in the universe