Baldi is the main antagonist of The Mystaman Indie Video Game, Baldi's Basics in Education and Learning.
Baldi originally appears as a supportive and helpful teacher, as he helps to guide the player. He was constantly happy until the player makes a mistake with his math question, even if the question is considered unanswerable. Once the player makes the mistake, Baldi's happy face turns into an angry one. He is later shown to be quite cruel and abusive when he inflicts a penalty on the player as retribution for an incorrect answer.
Despite his manipulative and treacherous nature, he is shown to be extremely pleasurable when he congratulates the player after the seven books are all collected. Although, Baldi soon threatened them to get out while they can and starts chasing them immediately afterward.
Baldi is a tall, slender humanoid with long arms, pale skin, huge black eyes, and red lips. He has a big smile on his face. He wears a long-sleeved green shirt, blue pants, and light brown shoes. Despite being seen as bald, he has one string of brown hair, which is often mistaken for a third eyebrow.