Okay, let's see. Tadashi would want someone more grounded than him but they would have to still be rather fun loving. Also, he likes intelligent people. Tadashi does infact watch anime and he will admit that anime that makes him cry are his favorite, so it goes without saying that he really liked AnoHana.
Mikami doesn't spend much time watching tv, so he doesn't watch anime.
Firstly, whoever he'd end up with would have to be fine with kids. And they'd have to be okay with a busy work schedule. And be okay with cuddling because Mikami likes cuddling and be supportive and inquisitive, because Mikami isn't the most open and it takes some prying to get him to open up. Idealy, he'd also like them to be more emotional than he is.