Allen Calloway

 Allen Calloway''' was the childhood friend of Ada Thomas. He was in his second year when Leah went to school. He kisssed her on the Hogwarts Express on his first day and after that, Leah Thomas had no feelings for him.

In later life,he remained confused over Ada Thomas's death and at one point, mistook Leah for Ada.

In his second year, Allen was pushed off of Ravenclaw Tower by Devyn Genevieve Wright, who was under the Imperius Curse at the time. He drowned in the lake, and later visited Leah with Ada when Draco Malfoy tried to kill Leah.