Hi everybody
I wanted to create a Rogue PC and i was considering the possibility of taking the Assasinate master trick but i just noteced that apparently rogues can't choose any of the ninja's Master Trick; am i correct?
Yes, that's right. Ninjas have the option to get up to one rogue advanced trick but not vice versa.
Since the Assassinate master trick is far from overpowered at level 10+, and the lack of symmetry is weird there, your DM might well allow you to get it anyway.