Oh my gosh, these gals are adorable! You sure know how to pick 'em, Luci. 
Obviously, the True Route would see you happily married to all of them! But if you're aiming for one, I could share a few thoughts...
Mitsue Remi:
She is into sailing around calm lakes to fish and read books, slow walks, very kind but implies to be wealthy.
Ahh, the wealthy girl. A stately keeper of her estate. The kinda gal who embodies everything noble in High Medieval legend. And with coffers for weeks, she may as well exist in the realm of fantasy. Wouldn't you love to live in her kingdom?
Yuuma Hisako:
It means "Distant, leisurely auspicious child", just about my current age, the clothes she wears depicted indicate that she likes the snow a lot, if it is really snowy, she'll stay outside and enjoy its surroundings, perhaps born early February. She is middle-class, has a habit of going to Sapporo annually, and is shy.
This gal here's the textbook example of "Kuroneko Syndrome". The gal who's well-loved by your fandom (In this case me. ^^), but ultimately fails to romance your main character. And I'll admit, I could certainly see the two of you watching the snow fall in Sapporo, clad in thick coats and clasping hands through woolen mittens. The very thought brings a steady warmth to my heart. I doubt she'll win, but I imagine she would complement you splendidly.

Kazato Suzu:
She tends to whistle to the wind on windy days often, even when inside if she is awake as an indicator of whether the day is going to get bad. She is slightly older than I am, around 25 years of age.
August, in my travels, has always welcomed those folk who seem destined to lead tempestuous lives. The challenges of adulthood, be they disease or poverty, are thrust upon them in their early days, and that awful experience forever leaves its mark their character. The impression I get from Kazato is that she's someone who's dealt with considerable hardship in the past, and still has yet to escape that. You might have to comfort her in her darkest hours. But in return, you would get someone who looked upon you as the light of her life, and in every respect would cherish you forever.
I take it back. Hitarashi and the others are wonderful, but this is the one I'd want to end up with. <3
Edit: I honestly have no idea how this ballooned to such a length. Maybe I've still got the creative spark, after all.

