Reginald Fairfeld is an annoying British man who follows people around, charming them into letting him stay with them. He chased Amy and Alan through Europe, eventually losing track of them. Years later he found them again in Philadelphia, and tormented them and their neighbors. He also tries to latch on to Gordy and Jedidiah Lawrence, until he is apparently scared off by the latter.
Cory is amused by his British accent, and often imitates him.