i think that kui portrayed kabru's mental health issues in a very interesting way, but it's what makes it subtle to some readers. the fact that he seems so functional to the readers, especially in the first few appearances, not to mention that a lot of his problems and symptoms are not obvious and can only be seen in additional materials, seems like an intended choice from the character writing perspective.
the way kui constructs his character centers around the idea of duality. he switches between two "faces" in the story constantly, he uses two speaking styles (and two pronouns indicating them), he's a tallman who lived with elves for a long time and carries both cultures, he's caught in the conflict between long-lived and short-lived races, he's constantly stuck between two choices in his inner conflicts (what to think of laios? should he prioritize preventing another tragedy or taking away power from long-lived races?), he's bisexual. kui also made him a gemini, yknow, a zodiac sign associated with twins and duality.
there's a certain theme in this and it does affect the way we interpret his personality and choices and it goes beyond text, it's metatextual too. it's a sway between what's hidden and what's shown to the readers about him.
the thing is, i think his mental health issues are meant to be downplayed and hidden, because it's true to his character. what do we notice about him in the main story and what's hidden? well, one of the first things we see is that he's not great at fighting monsters, he suffers from ptsd that makes him basically freeze up just from thinking about them. images of dead people turning into monsters, tearing each other apart and eating each other haunt him, making him feel ill from monster food. he downplays this a lot, hides it from other characters, straight-up lies about it, but at least readers got to see it.
with a keen eye you might notice that he doesn't eat enough food, almost never eats anything on-screen. he mentions that he's never cooked food in his life: wait, kabru, don't you live alone? in that sense "don't you wanna eat?" moment reveals two details of kabru's character at once: we got to see his aversion from monster food related to ptsd, but also his inability to notice his own hunger in general. he's strong and he almost always wears armor, but we know that he often dies in the dungeon. the armor hides that he's pretty scrawny for someone who fights physically, again, something that we can only notice after he takes off his armor (symbolism!).
funnily enough, here we have our first glance at this through additional materials: in the info page about the importance of calories and fat, kui mentions that kabru has lost a lot of weight since he started exploring the dungeon, because he died a lot. what it means is that he doesn't eat enough to cover the loss of weight. subtle, but clever detail.
speaking of him not knowing how to cook, this is another clever detail that hides bigger truth: kabru doesn't know how to do chores, he doesn't take proper care of himself. extra materials reveal to us that kabru lives in the basement, lacking light and clean air and he doesn't know how to clean his room or how to iron clothes and simply... never cared to learn? this is mostly omitted from the main story, even if it does have a place for it: for example, his journey with mithrun becomes infinitely more fascinating, when you know how little kabru cares about himself. but since those chapters are told through kabru's pov, he basically "hides" this from the reader, takes control of the narrative in the same way he tells a polished version of his tragic backstory.
he talks about mithrun's story like there's no connection, like he's not literally looking at the dark mirror of himself. and, ironically, he chooses to not be vulnerable in front of the readers just like young mithrun wouldn't. extra materials give us a glimpse again: when in the main story mithrun said "i can't fall asleep without spell or potion", in the extra comic (literally behind the scenes) kabru says "i use alcohol to help me fall asleep". there's a connection and kabru sees it, but he's not telling it to us. (and yes. there's evidence that kabru is an early-stage alcoholic. we can see bottles under his bed and what he says basically imply that he depends on alcohol: he's not using it for recreational purposes, he's using it as a substance to make himself sleepy and, probably, less anxious. when that dependence turns uncontrolled, it often leads to full-blown alcoholism).
bigger connection to mithrun is of course kabru's refusal to accept his own humanity, to see that he's alive, that he has his own needs and desires. he's suicidal in the same way: he can only see his goal, he doesn't care about his life, he only sees the value of his life in relation to that goal and he never think what's gonna happen to him after he reaches this goal (because he unconsciously believes that "the after" wouldn't happen to him). and he doesn't reflect on it, again, until he's met with a question "what do you want to do?". the way he doesn't see himself as alive is omitted again in the big portion of the story and only really comes up in the end, when he asks "what was the point of my survival?", in a basically joking moment.
but we can see it through the symbolism, through his connection to death in the story, through his eagerness to sacrifice his life for the idealistic goal in his mind. and of course, we can see it clearly through his mirror: there's a strong parallel between kabru almost committing double suicide while chasing his goals and mithrun literally getting himself killed while chasing his own.
what i'm trying to say, it's interesting that kabru uses his control of the narrative to hide his own vulnerability from the readers. maybe mithrun sees himself as leftovers and it's something cathartic for him to admit in the end, but kabru really doesn't want you to see that he feels the same way. that he's also "leftovers". but you see, they are standing together in that panel. as kabru continues to try shielding himself from your view, kui puts the mirror next to him, revealing what's hidden.
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