Stavian III was said to be an aristocrat/wizard in Inner Sea Magic. I don't know if this changed or not
I parsed the thread and found no love for our iconic samurai, so I thought I'd give it a try. So here's a version of Hayato who pushed "to be lawful or good" a little bit too far.
Mirror universe Hayato:
Mirror Universe Hayato CR 3
Human (Tian-Min) Samurai (Order of the Black Daimyo) 4
Lawful Evil Medium Humanoid (Human)
Init +3; Senses Perception +5
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Honor is strength. It is a maxim that Nakayama Hayato has known since birth, and one whose barbs he still feels deep in his flesh. But Hayato learned the hard way that honor has a price, and that you must be willing to pay for it. Hayato did.
Hayato was once a vassal of Lord Nakayama, a noble and just master of a province in Minkai. But an arrogant rival noble arrived one day and, after provoking him, killed Lord Nakayama and took possession of his holdings as well as his wife. Hayato knew he had to avenge his lord, even though he was now the vassal of this pig. He sneaked into his bedchambers one night and challenged him to single combat. The usurper tried to call the guards, but had no choice but to fight for his life. He fought well, but still fell until Hayato's blade.
Hayato knew that he had broken the law by killing his new master, even if his cause was noble. He took off his armor and prepared to kill himself, but his blade was stopped by Lord Nakayama's widow. Lady Nakayama thanked Hayato for avenging her husband, and, spitting on the usurper's corpse, said that she was now Hayato's master and he was to obey him. She ordered him to live, and to become her soldier. Hayato, bound by honor, accepted.
But after a while, Hayato noticed that his new master was not as benevolent as she seemed. In fact, one of her first actions was to declare one on the neighboring clan, with Hayato as her general, despite the peaceful relations they previously had. Hayato watched as his master's ambitions grew larger and larger, and as he was sent burning and pillaging her rivals' territories. Hayato felt conflicted : he was bound by honor to follow his new master's commands, but he started to feel that he had only traded one evil for another.
One day, Hayato was told by his master to come to her side. Her soldiers had captured a would-be assassin : a young boy, no more than fourteen years old, who had sneaked into the palace with a dagger to get revenge for his family's murder. Lady Nakayma, as a mean of proving his loyalty, ordered Hayato to bring her his head.
He raised his blade, and the boy's head fell to the floor.