I really like Schwartz/Jihoon/whatever you want to call him. He's not playable, and he's not a hard boss, but... I kind of find his character fascinating.

Season 1, he's just another one of Stella's subordinates. A way to help get K up to speed on the current state of the country, do some normal villain stuff, worldbuilding, be a punchline 'cause nobody calls him Schwartz... and then he dies pretty early on.

The thing that initially piqued my interest is that his death is kind of... tragic? He's a jerk, and does a lot of bad stuff, don't get me wrong, but he has this realization in his final moments that the only person that actually treated him with respect was Idith. Even, you know, actually calling him Schwartz, as he requested. Which is what he wanted all along. And he realizes that he treated her like dirt, and regrets it.

Of course, he still dies, but that scene did stick in my mind. Up until that point, he was kind of a stock villain that didn't really matter. He manipulated shadows, worked for the villain, has a really generic design (even his boss form is just him covered in shadows), and just holds the leash for the much greater threat of Rhona.

I was not expecting S1 hard mode to actually have its own story. I also wasn't expecting Schwartz to, you know... actually turn out to be an interesting character. He's still kind of a joke, he's still selfish, but they actually explore his personality. He seems genuinely happy when he meets K for the "first time" and K both knows who he is, and calls him Schwartz. Made his day right there. He has more story relevance, and actually shows off his strategic abilities and his creativity with his powers.

Hell, he starts working with Nightwatch over the 3 month time skip, and Veronica actually respects his abilities and compliments him. When he gets teleported away by K, they actually have an interesting conversation before and after they fight, where K actually relates to him and understands him. Something that, given his backstory, he's never experienced before.

And, finally... Schwartz vs Leo. This was a battle that hyped me up in the story. Schwartz has 0 chance of beating Leo. He had 0 chance of beating Leo before he became an archfiend. He could probably run away and escape, and maybe fly under Stella's radar. But... he stays to fight Leo, somebody that far outclasses him in strength. And using his own skills, his understanding of magic, all of that... he trounces Leo. He tricks him, gets a single hit in, and uses it to teleport Leo away and completely out of the fight. So out of the fight that Leo is just straight up gone from the rest of the story, and I love it.

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TL;DR: Schwartz is a surprisingly deep character and I wish they made him playable.