Henry Warnimont is a fictional character from the animated television series Hey Arnold!. He is the grandfather of the main character, Arnold Shortman, and is known for his kind-hearted nature and wisdom. Henry often provides guidance and support to Arnold and his friends throughout their adventures in the city of Hillwood. In the series, Henry is depicted as a retired man who enjoys spending time with his family. He has a strong bond with Arnold and often shares stories from his past, teaching valuable life lessons. His character adds depth to the show, highlighting the importance of family and community.