Kurume Suri was a boy who appeared in the Ami's First Love anime special episode and manga side story. He got good results in many practice exams, under the pen name "Mercurius," and Ami Mizuno considered him a rival. He wore thick, square-shaped glasses, and looked similar to his friend Gurio Umino.

http://www.wikimoon.org/index.php?title=Mercurius