i see it often that people do not see laios liking kabru, but in reality laios does like kabru! quite a lot for a guy that (from his perspective) he just met! laios forgetting kabrus exact name is not evidence of disinterest in any way--hes only heard it a couple of times, he struggles with small details (unless you want to argue laios also doesnt give a shit about marcille, chilchuck and senshi, he also forgets small details about them. if you do think this, i think dungeon meshi may be too advanced for you. stick to bluey.), and the man has autism. like near explicitly.
laios offers food from their limited supplies because kabru showed an interest in eating monsters, and makes him an omelette so he can have something to eat even though other food was already being prepared. he listens to kabrus criticism of his behavior and mindset in trying to protect falin even though she was straight up killing people, and tries to drag kabru to safety. he watches kabru defuse the situation between himself and toshiro masterfully, and confides in him how hurt he is that toshiro is so angry and how he mustve done something truly awful to upset him like that. when kabru tells him that meeting him was the best part of his time in the dungeon, laios agrees and says its the same for him (remember: laios doesnt do empty platitudes well--if he said it, he meant it).
when kabru leaves, we get three fucking panels in a row of laios staring after him, flexing the hand kabru was just holding, and reflecting on kabrus words ("next time..?")
when kabru shows up again deep in the dungeon, chilchuck is suspicious, but laios is so excited to see him that he throws caution to the wind and lets kabru hold his hand again despite seconds later crossing succubus off his list of shapeshifters that could be appearing as kabru--a carelessness around monsters and danger laios rarely exhibits. when kabru gives his warning about the canaries, laios is grateful. he notices how often kabru saves his skin
when lycion reveals that kabru lied about wanting to eat the omelette laios made, it breaks his heart because he made that with love! he made it for kabru, and kabru didnt like it, and now he knows kabru was just playing at friendship to use him. that breaks his heart, hes distraught, but he doesnt have time to be hurt about it when marcille needs his help urgently so he turns to run to her. he apologizes to kabru and tries to leave again. he isnt listening to what kabru is saying here because kabru was just revealed as a liar and because it doesnt really cohere (kabru is stuttering and speaking in broken sentences as he tries to explain about the dungeons power) and he needs to save marcille
he doesnt believe kabru wanted to be his friend, because who would? why would laios be special enough, loveable enough, to go through the pains kabru went through, just to be his friend? but when kabru makes the intensity of his desire known, laios promises to feed him again, at a proper restaurant --and again, food is care for laios, to feed someone is to love them. marcille is still his priority bc she is in real danger but he means what he says, he really does want to start over with kabru and be real friends with him
once we hit the resolution of the story, kabru near glues himself to laios, helping him and trying to cement himself as a right-hand man, and making known his intent to support laios no matter what. in the medieval manuscript style epilogue, kabru is one of two friends that stick by laios as he becomes king. both marcille and kabru become the people closest to him (besides falin of course), two friends who will always support him, always let him know when hes fucked up and theyre mad at him, two friends who he can rely on. laios did not have to accept kabru as an advisor, he did not have to ask him to stay with him. he did that because after everything, he trusts kabru now, and knows he can count on him
while laios doesnt give any big monologues about what he likes about kabru, its very clear he does, and we know what things laios values in other people. he appreciates kabrus social skills (very clear in the post canon comic in the adventurers bible), his intelligence, that kabru WANTS to be around him and understand him even though its difficult, his strength, and frankly he does appreciate his charm (three fucking panels straight of staring after him). laios really values people with specialized skillsets who are willing to tell him frankly what they think and advise him in areas he is weak in (something we see in his relationship with... i was gonna say namari but its everyone. he does this with everyone he likes. and in the resolution kabru does this CONSTANTLY he does not go a panel without giving laios his professional opinion on how to deal with people).
in conclusion: arent you hungry, kabru? let laios make something for you