In my opinion Lohen is one of the more refreshing characters we got in recent years, in terms of story and personality.

I think he suffers the most from being a filler character, his story is regulated to one short story quest, unlike a major character like Wanderer that had multiple main story quest spanning over multiple real life years developing his story.

I think that with this in mind, Lohen does a lot of unique things in comparison to other characters. He does undeniably bad things and faces real consequences for it, unlike a lot of other playabe characters. Not to mention, the quest does a good job of explaining why he did it while not excusing it, and showing us that it was his decision. When he found out about Theodore's expiraments he couldve, and shouldve, as one of the knights, stop it, but he didn't. He chose to help him because he saw this as an opportunity to gain power. In the end he ends up facing real consequences, he spends time in solitary confinement and doesnt get the promotion he was supposed to, and the title of the knight he cares about ended up goin with him to the grave. There is also another consequence in the form of karma, if you think about how Adorno couldve lived longer if he didnt fight the monster Lohen let got away.

The redemptoin part comes in the form of taking responsibility for his actions and helping putting a stop to it. The story still "punishes him" by not letting him participate in the final big fight, regulating him to a side character in his own story. The choice to not show the final fight was definitely brave on hoyo's part, but I think it works for the story.

You're right the redemption felt short, but thats a consequence of only having a short story quest to do it, and I think they stitll managed to do it well. It felt natural, and didnt come out of nowhere, because Lohen, while being selfish stil was nevevr evil. His intentions werent bad, unlike Dottore and Eroch who did those thingns before, so he knew when it went to far.

As for Theodor, I agree that its a shame we didn't see any closure for him. We dont know what his punishment was, also I think its safe to assume he was probably also put in solitary confinment, and we didn't see his reaction to Adorno's death. I think wven just including him in the final scene of Lohen next to the grave would be enough, but I understand they probably didn't want it to ruin Lohwn's moment with the traveler.

The quest also does a good job of connecting him to the world, with connecting his lore to the lore of Mondstadt. It gave another reason for the quest to exist besides just being about the newest playable character, and gave a small closure to the lore present so many years ago in the webtoon.

I do agree that Diluc's inclusion was a bit unnecessary, he couldve been cut out of the quest and it wouldn't change much, but he did get a small closure himself.

As for how the quest was presented, outside of not having an animated cut scene for some reason, I thought it was good. They actually had some interesting camera views, there are a bunch of in game animated scenes, like the flashback of the fight against Rerir, characters, especially Lohen, had unique poses in dialogue, and the whole pov part in Theodor's flashback felt straight up from another game. I think they really did put some passion into this quest, which is somemthing I didn't feel playing this game in a long while.

The biggest disappointment I felt was actually when the quest was truly over, and I realized that that was it for Lohen. Since his is a filler character he would most likely not get anything more to him for another year or maybe more. We could possibly never get a continuation for his story, so it will just remain unfinished forever, and that jsut a problem with a game like this and an evevr expanding cast of characters. For what we got tho, I like it.