Erik the Red is an infantry hero in Age of Empires II. He is only available in the Scenario Editor and in the Vindlandsaga scenario. He has the appearance of a Berserk and the stats are also similar, but Erik has significantly more hit points. As a hero, he cannot be converted and can regenerate health (since The Conquerors). Erik does not heal faster than other heroes, though (despite being a Berserk).
Like other infantry, Erik the Red is affected by all upgrades that affect infantry as well as any other bonuses that affect them.