Charles Dorian Assassination Variety Pack
[Front-paged. -stabguy]
Speedrun
The fastest way I found of running through the memory. Starting at th first checkpoint, you would think the first place to go is the front of the building to start the scene, but as it turns out, you can go right to the window, skipping the first part.
The next part is tricky because of the no detection requirement. Try to blend right away when entering the first room to avoid being seen. I assassinate a guard whose patrol route takes him to the next room to save time, but didn't dare run when a guard spots me.
Jumping straight ahead from the window you usually land right in front of the guard, but can run behind a pillar before his detection meter fills all the way. From there it's easy sailing just running to the target. A small scene makes you temporarily lose control of Shay.
Charles Finds His Son Arno
Lead Charles to where Arno and Elise are. Coincidentally, this make Charles stop calling for his son.
Slightly Early Death
When you first reach Charles in the building, he normally can't spot you until after the scene, but if you make him respawn by going far enough away and coming back, his AI is reset. Now you can make him follow you without starting the scene and kill him, but have no way of progressing.
Deja Vu Death
If you restart the checkpoint after reaching the final part of the mission (has to be on a run from the start of the memory), a strange glitch occurs. The option at the beginning of the memory of infiltrating the place appears, along with the original Charles and Arno Dorian at the front of the building! Killing Charles Dorian 1.0 has no effect on the memory.
Stunt Assassination
The nostalgic jumping from a great height to instantly assassinate a target. Using the "deja vu" trick, the front door is open. Now you can set the target up for a stunt outside the building, which shouldn't be possible.
Scaredy-Cat Charles
An extra. The original Charles Dorian has the AI of a civilian and runs away if you bump into him.
Nice trick with the de ja vu!
Can you double assassinate both Charles Dorians simultaneously?
And, since I tried and I know you tried, did you find any way to kill one of the two Arnos in order to prevent Unity from ever happening?
“Force has no place where there is need of skill." Herodotus
I tried getting both Charles at once, but it wouldn't work since Charles 1.0 is considered a civilian (you can even blend in with him and other civilians). I also moved him by that one chair so he'd be in the end scene, but the game despawns him.
I haven't found any way of interacting with young Arno. Speaking of whom, one time I killed a guard in front of Arno and Elise to see if they would react, and the game acted like they were a wall, making Shay perform the wall environmental kill. 
Arno must have some great core strength as a child to essentially be a wall.
Also, the designers clearly didn't want you messing with the two kids (making them behave as a wall)... but maybe cloneArno would be different, even as a civilian...
What tools/weapons are available to Shay in this memory?
“Force has no place where there is need of skill." Herodotus
Hidden blades, fists, and if you pick up an enemy's sword. You can loot Charles after the Early Death, but don't receive anything, so money isn't available.
Is Charles Dorian a main assassination target in Rogue? He wasn't on the list of targets provided by Cheese so there's currently no way to tag him on THB. If he is a prime target, please specify the Sequence number.
He is a target in the story, but probably the reason why he wasn't mentioned is because
Also since speedruns and blitzes are so similar, why not change the "blitz" category to "blitz/speedrun".
He's not one of the sequenced campaign targets.
“Force has no place where there is need of skill." Herodotus