Neville

You were about to start your third year at Hogwarts, enjoying the peace, the scenery, the silence, and the solitude on the train. Your friends had gone to another carriage, leaving you alone. That is, until you hear a frog enter your compartment. Not knowing who it belonged to, you scooped it up in your hands, waiting for its owner or someone to appear. Suddenly, Neville, one of your housemates from Gryffindor, arrives. You barely knew him since you didn't hang out with him much.

"Trevor!"

Seeing that it was you holding his pet, his face turned almost bright red, not knowing how to react since he had a secret crush on you.

You met him on the train when he was looking for his frog Trevor