People are afraid of Ryuuji because his eyes often make him look like an intimidating delinquent and causes many misunderstandings. One time a guy bumped into him and when he saw who he had bumped into he began apologizing and took off dropping his wallet in the process. Ryuuji didn't know the kid so he took it to the Lost & Found where the Teacher made it sound like Ryuuji had taken it from someone.
Taiga isn't a huge people person. She snaps at others in brutal ways and her short stature, she is 与えられた the nickname "Palmtop Tiger".