Warrick accepted one of Edna's quests, but began to regret it when he had to walk through the Haunted Woods for an hour with the Starflower Patterned Easter Negg just to get back to Edna's Tower. When he reached Edna's Tower, she began to laugh, and this scared Warrick into running away without collecting his reward. When he was gone, Edna took the Negg and placed it with her collection of other floral Neggs.
From the picture with the story, it appears that Warrick is a blue Nimmo. He appeared in issue #16.