From what I've read, Katarina isn't really in love with anyone (or at least she has yet to realize she's in love). Yeah she's kissed some of her harem (Not gonna spoil who) but she hasn't really answered their feeling and constantly avoids the issue. Honestly as much as I like the LN, its getting kinda repetitive
^(I suppose that doesnt count as an @...) Series of course. Even I wouldn't go that far for this pairing. Maybe once Kobayashi stops being a coward heh.
^I'm pretty sure their first real kiss (which is like the third in the anime) is pretty much the same in the manga (minus the fan service animated make-out session.) Same with the way the asks her to "take responsability" for now being her mana replenisher. The only time where she's embarrassed about anything.
I also remember that moment after defeating Bazett, they both fall dead-tired in the same bed, and Kuro turns bright red after making eye-contact with Illya. Even Illya is like "what's with that reaction?" and Kuro just goes full tsundere and leaves the room. In the anime they just fall asleep.
^She was embarrassed several times whenever people see through her tsundere facade actually. She is like Archer if he wasnt cynical, but just a tsundere ("so just Archer" I hear you say lol). I did forget about that bed scene tbh.
^ I don't blame you, it's was short, but it was also the first moment where I was like "Aaaw beneath all the Fate+yuri fanservice, there can still be some wholesome moments".
Too bad when most people think of Fate/kaleid they automatically associate it with "lolicon material"... There's some real yuri potential in there.
^I love Prillya for the humor, plot and amazing lore integrations. The author is an absolute TM fanboy and gave us some of the coolest Fate moments disguised as a comedic magical girl parody. The loli fanservice is the only blemish on the series imo.
There is obviously a very strong case for Illya x Miyu being the main couple. It's kind of what has been worked on since chapter 1. I'd say this has been yuri subtext from the start. In fact it's not been all that subtle at all.