On one hand, he killed loads and loads of slavers, and helped to bring down their extremely brutal empire by aiding a slave rebellion. On the other hand, he also killed a bunch of people who probably didn't need to be, to the point that the mer describe as the leader of a Elven Pogrom, and he also killed a bunch of Khajiit who weren't even doing anything because he mistook them for elves.
He was also a gay insane cyborg from the future with a Mega-Man style arm cannon, and I'm not sure if his homocidal tendencies inspired from his Shezzar-Akatosh Duality Madness make him 100% responsible for his own actions.
I must have missed a lore book or something
The Song of Pelinal, v3
Michael Kirkbride, who wrote Knights of the Nine, wanted to say that Huna "shared a tent" with Pelinal, but Bethesda thought that would infringe on the fact that the player was reincarnating him.
On the "Insane cyborg from the Future" part:
The Song of Pelinal, v2
Here's where the Arm Cannon comes from
The Song of Pelinal, v1
All this is from in-game sources, with Michael Kirkbride himself adding a few years later:
Man, Elder Scrolls has such interesting lore and yet the games themselves just keep getting more and more generic
Everything good in the ElderScrolls universe owes it's existence to amphetamines. Fuck Kirkbride, Tina is the Godhead.
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Even the elevator pitch for a lot of these concepts is cool as hell. Knights of the Nine is "hey what if The Terminator (1984) happened basically beat-for-beat in the elder scrolls history except skynet was fighting racist elves instead of humans, and then you had to go finish the T-800's unfinished business? also what if we casually threw in the fact that elves used to have feathers"
You missed the part about him yelling out the name Reman after biting out a dude's neck veins even though Reman wasn't a famous emperor yet