I currently have two students at Hogwarts:

Miss Sisse here is a 6th year with an older and younger brother. She is super friendly is everyone except for Holly Scrimgeour, so I could see Sisse trying to be friendly to Clarke despite how Clarke acted. Sisse is also the Charms club president and in dueling and Potions clubs.

Then I have wee little firstie Katherine Arundell "Kitty" who is a muggleborn daughter of an earl and is rather accident prone and incredibly curious.