Rin is a perceptive, serious, resourceful and very competitive person. Though she is widely-admired at school as an honor student, it is a front she puts up in order to prevent others from prying into her life. In private, she is notably stingy and bossy, but usually means well for those she cares about (a personality possesssed by most tsundere) Her perfect and coldhearted personality is probably taken from her father who was also a magus. It was later revealed too that Rin eventually fall in love with Shiro (one of the main character in the series) TOP 4 MOST POPULAR TSUNDERE IN ANIME