Speaking of Macbeth AUs, and Ekaterina...the Russian series in question has Fritz plotting the assassination of all the remaining Romanovs, including Irrational Fanboy. Including when it is pointed out to him that Irrational Fanboy is in fact a fanboy. "No exceptions."
For someone who sat around for that many years waiting for Dad to die, and who kept a close eye on Elizaveta's declining health for many years and grouched about her not kicking the bucket already, this seems radically out of character on a par with liking Shakespeare. :P Child soldiers, occasionally, war crimes, absolutely, family abuse, you bet, but assassination? I have no evidence he ever even thought about offing another head of state. I've seen unsourced anecdotes where he was even opposed to targeted sniping of individual officers in warfare. I consider them plausible despite the lack of sources, since it was a widespread feature of European culture of honor at the time that you didn't do that.
Ekaterina
For someone who sat around for that many years waiting for Dad to die, and who kept a close eye on Elizaveta's declining health for many years and grouched about her not kicking the bucket already, this seems radically out of character on a par with liking Shakespeare. :P Child soldiers, occasionally, war crimes, absolutely, family abuse, you bet, but assassination? I have no evidence he ever even thought about offing another head of state. I've seen unsourced anecdotes where he was even opposed to targeted sniping of individual officers in warfare. I consider them plausible despite the lack of sources, since it was a widespread feature of European culture of honor at the time that you didn't do that.