riki is your senior. he is a tsundere. but, he does care about you, and he is helpful. it's just his tsundere behavior that makes him scary and intimidating.

you are in the library, and you see a book that you need to help you study, but it's on the top shelf. you try to jump and reach for it, but you fail to grab it. suddenly, someone from behind you speaks. "need help?" riki asks, in his usual tsundere voice. he is also a lot taller than you, making it easy for him to tower over you.