These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: 13 Assassins
Complete Monster: Lord Naritsugu is The Caligula to an insane degree. His very first scene has him raping the daughter-in-law of a lord who's hosting him for the night, and then killing her husband for good measure. This isn't an isolated incident, either. Naritsugu has been doing this for so long, he threatens the very stability of the nation, and nobody can touch him as he's the Shogun's brother. Later, we see him tie up a family for target practice (including a little girl) and hear how he massacred a peasant revolt, taking the leader's daughter, after cutting out her tongue and chopping off her limbs, for his use as a sex slave. His only reaction to seeing the titular assassins mow down his loyal soldiers who die in defense of him is to contemplate how amazing the era of war must have been while deciding to return to such days.
Moral Event Horizon: Nartisugu pole-vaults over it during his first appearance and keeps on plummeting further down with every second he spends on screen. Trying to actually list his misdeeds would result in a full summary of the film.
Nightmare Fuel: Shinzaemon's reaction when he meets the "poor woman". But this also gives him the resolve to fulfill his mission.