[quote=@VitaVitaAR]
Catalysts specify a Servant(and in the case of Assassin for a traditional Holy Grail War can overwrite the Class being a catalyst for Hassans), but if you don't have a Catalyst you'll get a good match for your personality.

[b][color=ed1c24]For example, if Rin had pulled off her summoning perfectly and there weren't [i]certain other circumstances in play[/i] she likely would have gotten Arturia because they synch up incredibly well.[/color][/b]
[/quote]

I can almost listen to the whimpers of a certain dog who's said to have the greatest compatibility with Rin in the corners of the Nasuverse.