what kind of visual novels are you looking for?
Games
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Steins gate, 13 sentinels, etc. All of them contain romance, but they all have larger narratives that are on par with Fata Morgana
And if you want a political VN, consider Suzerain
What? There are plenty of good VNs, this sounds more like you have a hangup over romance. If you want to avoid your hangup you can just search up the tag excluding romance on vndb, btw.
Also, it's been a very long time since i have played fate, but illya is specifically not a love interest. Not that the sexual comment in fate is anything but a meme.
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I am talking about Saber. They say that her weight is about 40kg and based on CDC data 40kg for girls can range in age from 9 to 15.
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I would probably not use CDC data for this. From what I found for Japanese women:
Among the women with height ranging 149 cm and less, 79% of the women have their waists in the range 56 cm to 58 cm and the weight is in the 35 to 39 kg range. In the 150 to 159 cm height group, the weight range is 40 to 45 kg and the average waist size is 61 cm.
And saber is listed as 154 cm, so her weight would be perfectly average for an adult woman.
She's not Japanese
It is a Japanese game. I would say that almost none of the characters actually look they are from the place they should be. If her story makes you uncomfortable, that is fine. But I wouldn't base it solely on one throwaway piece of information that you probably couldn't even find in the game itself.
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Canonically, she is supposed to be probably 25. And I would say that is a reasonable portrayal of someone who was forced into being queen at the age of 15. Again, completely fine if that makes you uncomfortable, but if you are uncomfortable with this, you might have some more issues later in the game. (Not sure how far you have gotten.)
The Fandom wiki page says physically 15yo and cites some spinoff that I don't know about. But yeah I hear you. I shouldn't fixate on that too much.
EDIT:
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I would say that almost none of the characters actually look they are from the place they should be.
That Gilgamesh is now my headcanon though.
Ever 17: The Out of Infinity is very very good and to my knowledge doesn't contain any sexual content - I think there is a smattering of romance but it's not the main thing.
I played it like 12-15 years ago though so may be misremembering some things!