Misaki is a kuudere. Just like not everyone like tsundere, not everyone can see the charm of kuudere. I think Misaki is very cute (when he's with Natsuo and Natsuo also finds him cute the way he is). Imo Natsuo and Misaki complement each other!
Also Natsuo may have liked Misaki for a long time. It's probably not exactly that Misaki's visual is his type, it's just that he deep down like Misaki that he subconsciously rejected similar looking people that's not Misaki. Other girls he went out with were not really a certain type in looks or personality, he just accepted them. In conclusion he just likes Misaki, whether it's his face or personality.
i get that Misaki has a lack of showing emotions but we can tell he's developing feelings for Natsuo by feeling jealous and what not.. and why are you wishing that on a bl, go read something straight then. it irritates me how clearly the characters are endgame in a ONESHOT manga and you go and blab about how you wish the Mc finds another person that looks exactly like the person he loves currently? you for real?
Sybau
This type of pacing, development, and relationship troupe are the ones that end pretty badly in some other mangas. Ones that are usually a past of a character. Like "I used to date someone, and we drifted apart pretty immediately as I knew he wasn't feeling the same."
Like, Misaki is too... how would you call this... not the type of a character that shines brightly, he's like any other exes in other mangas that face doesn't get to show up all throughout the chapters, like a mob character of the MC's or MLs' ex. I couldn't feel him at all. Sorry guys please don't get mad if I'm saying this. I just pretty much hoped Natsuo would be paired with someone else, at some point I hope this wasn't entirely BL. Like I wished Natsuo found a girl, may look exactly like Misaki but with a remarkable traits, something that would make Natsuo realized that he liked Misaki because of his looks which has been stated multiple times, so he could have fallen for a girl who looks exactly like Misaki but could be cheerful, kind, expressive and cute like how he wanted. I swear to god I wanted him to find a girl intead of Misaki. Sorry again don't be mad, am just stating my opinions and thoughts.