I love all the girls in this game. I think they are all extremely cute in their own ways. I find some of them especially cute when they are (more or less) out of their comfort zone: Naomi won't talk about real feelings, Lyriel is embarrassed by anything lewd, and Caitlin struggles with people complimenting her. I think Yona's cute in her simplicity and submissiveness, even though she was clearly something of a warrior before; and I love Rae's boldness while still having a real emotional connection to the MC.
Normally harem-type games tend to be way too unrealistic to me, but AHitR manages it well, both by being entirely fantasy and by having development of relationships steady and reasoned out (Rae's naturally very sexual, Yona is from a society where she expects to be used for sex, etc.).
Speaking of Yona, I also like that there are options for treating her with respect, trying to overcome an oppressive society's culture if not to give her respect for herself. I get it: she — and other girls — aren't for everybody. But I'm more drawn to personality traits anyway than physical ones. Honestly, if any one of these girls were real, I think I could easily fall for any of them.