Muggles' Guide to Harry Potter/Characters/Vaisey

Overview
Vaisey is a Chaser on the Slytherin Quidditch team in Harry's sixth year.

Half-Blood Prince
Just before the Quidditch match between Slytherin and Gryffindor, Ginny Weasley tells Harry that Vaisey took a Bludger to the head during the previous day's practice, and is too sick to play. This greatly heartens Ron, as Vaisey is evidently Slytherin's top scorer.