AFAIK, Fritzian envoys tended to complain that they were hamstrung by the micromanaging and being constantly in the dark and having no authority to do anything!
Prussian Count Rothenburg was briefly envoy to Versailles, as I recall. Peter Keith's son was envoy to Turin, but I know nothing about him and have contradictory information even on his first name (I saw some of his correspondence in the archives, though, where he gets named "Peter Karl", which I suspect he's being confused with his father).
I believe there were at least two Prussians named Mardefeld who were envoys to Russia, one under FW and one Fritz. Ah, yes, Wikipedia tells me uncle and nephew. One of them produced this painting of Peter the Great with a black page (who, as I'm now on the alert for, is wearing a silver collar, just like the one in the Fritz and Wilhelmine painting). (Btw, he looks short and is likely not at his adult height yet, but remember that Peter was 6'8"/203 cm, so take that into account. :P)
But yeah, it's hard to even name Prussian envoys off the top of my head. I indeed suspect Fritz's envoys never had a chance to shine because paranoid secretive micromanaging control freak.
Peter the Great with black page - at first I thought, oh, must be Pushkin's great-grandfather, but then I read the description and saw it couldn't have been because Pushkin's great grandfather was already in his 20s at that point. (He was also a fascinating character, check out his wiki entry, who lucked out within the bad luck of being a slave in that he got adopted by Peter, got to study at the university in France sponsored by him, and later was an important figure at Elizaveta's court. Otoh no one knows what became of the boy in the painting, who can't have been him.
Also, since you asked whether RussianFritz would have staged a coup against RussianFW or waited for AW's succession to stage a coup against: I think as a male prince, he wouldn't have had the luxury to wait. Russian FW would have either killed him directly or put him into a monastery. Speaking of which, SD and Wilhelmine would have ended up in nunneries in Siberia, too, as soon as those English marriage arguments got serious. As to whether Russian AW would have survved beyond a successful coup - only in the way poor Ivan and his siblings did, I fear, if he didn't get killed outright or died a few months later of some disease. (Heinrich and Ferdinand survive and stay at court by virtue of being young enough and there not being a Fritz heir around, assuming RussianFritz already has a clue he won't reproduce himself.)
Re: Saxon envoys and Russian threesomes
Prussian Count Rothenburg was briefly envoy to Versailles, as I recall. Peter Keith's son was envoy to Turin, but I know nothing about him and have contradictory information even on his first name (I saw some of his correspondence in the archives, though, where he gets named "Peter Karl", which I suspect he's being confused with his father).
I believe there were at least two Prussians named Mardefeld who were envoys to Russia, one under FW and one Fritz. Ah, yes, Wikipedia tells me uncle and nephew. One of them produced this painting of Peter the Great with a black page (who, as I'm now on the alert for, is wearing a silver collar, just like the one in the Fritz and Wilhelmine painting). (Btw, he looks short and is likely not at his adult height yet, but remember that Peter was 6'8"/203 cm, so take that into account. :P)
But yeah, it's hard to even name Prussian envoys off the top of my head. I indeed suspect Fritz's envoys never had a chance to shine because paranoid secretive micromanaging control freak.
Re: Saxon envoys and Russian threesomes
Also, since you asked whether RussianFritz would have staged a coup against RussianFW or waited for AW's succession to stage a coup against: I think as a male prince, he wouldn't have had the luxury to wait. Russian FW would have either killed him directly or put him into a monastery. Speaking of which, SD and Wilhelmine would have ended up in nunneries in Siberia, too, as soon as those English marriage arguments got serious. As to whether Russian AW would have survved beyond a successful coup - only in the way poor Ivan and his siblings did, I fear, if he didn't get killed outright or died a few months later of some disease. (Heinrich and Ferdinand survive and stay at court by virtue of being young enough and there not being a Fritz heir around, assuming RussianFritz already has a clue he won't reproduce himself.)