Nekota comes across as pretty detached—not unfriendly, just quiet and easygoing. He's fine with his classmates and not the type to seek attention, though he does have a habit of showing up late to class. The thing is, he's actually more perceptive than he lets on. He notices when Mikki's struggling or confused about something, which reveals how much he genuinely cares about people, even if he doesn't broadcast it.
His home life explains a lot of his maturity. He cooks for himself, his younger sister Meguru, and their father, who works late. Since their mother isn't around, Nekota's basically taken on that parental role. It's a lot for someone his age, but he handles it without complaining.
The weirdest part of his relationship with Mikki is how it started. She'd stare at him constantly and follow him around like a stalker—all because she wanted to see his "human" face instead of the cat face she apparently perceives. It threw him off at first, and honestly, he still finds it strange. But he cares about her anyway, and weirdly enough, he actually likes that quirky, obsessive side of her. He has no idea how she sees him, though.
As the series goes on, they get closer. Fans can tell pretty clearly that his feelings for Mikki go beyond friendship—he's definitely into her romantically.
Content compiled by AnimeList.moe from publicly available sources.