Henry is an assistant to Professor Magnolia, helping her research the Dynamax phenomenon. He is often referred to as by Casey and Professor Magnolia. Henry was born to a family of swordsmiths and was taught how to repair weapons. He used this knowledge to become a Tool Meister, where he repairs various objects Pokémon use in battle, such as his Lancelot's leek lance or his Twiggy's sticks.