+Twin tails
+Nice despite coming from a group of people known for some pretty freaky-ass research involving horrible perversions of nature
+Can be snippy, but usually for your own good
+Has excellent fashion sense
+ Easy to fluster by being too nice to her

Why is Rin so freaking adorable? I'm normally not that fond of Tsundere's, but something about that Mage girl just makes her so lovable and cute.