I have Ai Edogawa and Conan Edogawa, both first years from Hufflepuff.
Ai is afraid of separations causing her to have a hard time making friends. Her personality while facing others has two choices, be shy or be mean. On the inside she is kind and will be if others are willing to accept her outer personality. She can be a friend.
Conan is Ai's twin and he is very protective of her. Unlike Ai, he is very friendly and kind. He is willing to be friends with everyone as long as they don't dare to hurt his sister. He is not only protective towards Ai, but also to his friends because he values friendship greatly. He can be a friend.
Well, also, both of them likes adventures since they had a lot of dangerous adventures when they were in Japan.