Philosopher's Stone

Chamber of Secrets

Prisoner of Azkaban

Warrington is mentioned as being a Chaser in the Slytherin team. No other details are given about him.

Goblet of Fire

There is a rumour that Warrington, the big bloke who looks like a sloth, has put his name in the Goblet of Fire, to try to be a champion in the Triwizard Tournament. The rumour is never confirmed.

Order of the Phoenix

After Fred and George depart the school, there are a number of attacks against Umbridge's Inquisitorial Squad, of which Warrington is a member. It is mentioned that he goes to the Hospital Wing with a skin condition that makes him look as if he were coated in cornflakes.

When Umbridge catches Harry in her office, where he has been trying to determine whether Sirius has gone to the Ministry, she also sets the Inquisitorial Squad to round up his helpers. Warrington reports that they had also brought Neville, because he interfered when they were trying to bring in Ginny.

Half-Blood Prince

Deathly Hallows