Sabers Praetor wrote...
The Main Heroines for Fate/Stay Night are Sakura, Rin, and Arturia. No matter what your argument, this is a fact. Any other character, while potentially vital to the plot, are not the Heroine of their own route; thus Flaser is in the clear. If you have a problem with that, then he could claim just based off of Rin and Sakura as a sibling set.
Also Rider's original master is Sakura not Shinji. Rider was also summoned as an anti-hero. So while she may not necessarily be bad, she isn't exactly good either. And yes, Shinji is a Dick.
Should have quoted me sabers (aka sorrowbloodmist), and not bagman, since you're replying to what I said. I had to fix your sentences as well (ocd moment).
I can argue else wise, mostly because it is my own opinion. The other reason is because of the fact they they can be considered heroines themselves. You are right though, that even if the F/SN heroine set isn't complete, Flaser could still get another claim off of the fact that Rin and Sakura are siblings.
The thing about Rider's om being Sakura and not Shinji, escaped my mind... or I just forgot about it.