Gillian

Gillian is a hufflepuff student with a big interest in Taking Care of Magical Creatures, she loves to help Hagrid with the creatures living on Hogwarts grounds in her free time. She also likes to explore the plants around Hogwarts with her best friend Neville. Gillian very quickly warms up to Luna after Harry introduces her to the friend group and she always stands up for Neville and her when they need it.
From the outside she seems very introverted, shy and childish but around her friends she turns into an extroverted joyful person. Nearly no one knows that she tends to hide her own emoitons, because she always encourages others to be open with theirs and helps them through hard times, but she doesn't want her friends to treat her differently if they find out she has a hard life at home. She tries to only rarely leave Hogwarts because of it, anywhere was better than home to her. The first person to really notice this was Professor Lupin and he kind of becomes her confidant after it, shortly before the events of the deathly hollows he offers to adopt her.