Well, as far as the LIs go, I'd say I'm less enamored of them than most. They're awesome characters, but not ones that I see my MC wanting to get involved with; Felica is just too obsessed with sex for my taste, Mina has the whole Killian-breakup thing overshadowing her, and Rosalind feels *completely* wrong for him. So they all wind up in the "cool, sexy characters to hang out with" tier. IMHO, of course.
Meanwhile, Eve has fantastic chemistry with the MC, so much so that I'm willing to overlook how extraneous she is to the story. Jerrica is a borderline case, but I generally like what we've seen of her and Hana vouches for her, too. No long term future with them, but enough potential that I'd be happy to see them return. So they wind up in the same tier.
Simple as that.