Why does Solomon love Saya from blood plus?

Answer 1

Well, this answer might get a bit complicated.

It's difficult to say "why" Solomon loves Saya, given that most people tend not to quantify love in that fashion, and thus don't really have a particular reason why they love another person. However, one could say that, in addition to whatever feelings he's developed for her over time, Solomon feels somewhat the same way as Karl does in regards to Saya.

Karl loves Saya because she has Diva's destructive power and appearance, but actually interacts with him a way that Diva does not (in his own, warped case, attempting to kill him functions as an interaction and bond).

Solomon, meanwhile, has a somewhat healthier mind and outlook: she is very much like Diva, whom he loves dearly, but more personal, grounded, and mature. Whereas he can hardly count on Diva to so much as look at him on any given day, Saya is a more stable individual more willing and capable of loving another person (though, as the audience comes to realize, Solomon might not be that person). Any other feelings he has for her could potentially be built afterwards, with this interaction as a base.

Or I could be totally wrong. Who knows?

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Because she's a self insert character for the female viewer.