>>535119296
There's a connective thread between Passionlip, Castoria, and Kashin Koji, at least. They're all beautiful and cute girls who are deeply depressed and struggle to find happiness. (One of my other favorites, Draco, also fits this mold.. I'm attracted to those who have it hard, I guess. If I could Grand Draco as well as Lip, I would, but curse the limited extra slots.)
As for Hildr, I just think she's very beautiful.. Metatron is an angel, and I am infatuated with angels, if we had more angels they'd be all over my potential list, but she is our first and as yet only true angel. Walkure are somewhat angelic, and that's possibly why Hildr calls to me, but I don't equate them to angels so it's not the whole story. I really like her pink hair.. I don't know, I don't have many excuses for who I love.
Arjuna Alter, I greatly enjoyed Lostbelt 4. He, too, kind of fits the mold of a deeply depressed hero who's doing his best to manage and overcome. I feel a companionship there. Brotherhood is a good enough reason to Grand.
Paris, is my self insert. I see much of myself and my interests reflected in Paris. I've never sympathized much with the Master in F/GO. I would rather be Paris.
Summer Kriemhild is thus the one that stands out as not being an object of particular affection for me. But the problem lies in that I can't find ANY Rider class servant I care about to a significant degree. She's just there because she's cute enough. Definitely last among my Grands.