I also like Tatsuki's competitive spirit. I read a post in the Worlds Men FP thread quoting Tatsuki saying in the spirit of friendly rivalry that he will try to "CRUSH" Yuzuru this coming season, and my reaction was good for Tatsuki as such an attitude can only drive him to further improve (add another quad?) as well as keep Yuzuru on his toes.
One thing I also learned about Tastuki is, like Daisuke and Yuzuru, he has a supportive and nurturing mother. Perhaps that is the real secret of the success of the the Japanese men. Tatsuki's mom will travel some distance to bring him his favorite hairtail fish dish.