Who is Baldi?
Baldi is the titular main antagonist in Baldi's Basics in Education and Learning. Baldi is the head teacher of Here School, giving the Player math problems to solve in the notebooks to collect them. After the math problems are solved correctly (or incorrectly), the notebook disappears, storing it into the counter from how many notebooks the player obtained, seen on the top left on the heads-up display. He also owns a bus, originally owned by Joe. Baldi is a poorly modeled CGI (computer-generated imagery) human figure with long, skinny fingers, pale-tan skin, large red lips, and is bald except for what seems to be a singular hair on his head. He also has a long-sleeved green shirt, blue pants, and light brown shoes. Even though he has no visible ears, the description mentions that Baldi still has an excellent sense of hearing. Baldi at the start of the game. Personality
Baldi is known for his eerily nonchalant demeanor, and his dangerous personality is not immediately evident. He carries a facade of friendliness and a relaxed demeanor, though it most likely is his default mental state. He warmly greets students in a friendly fashion and uses positive reinforcement when they correctly answer his questions. He loves math and believes everyone else does. His love of math is so strong, other people failing to answer a math question shatters his psyche, and he undergoes a disturbing personality change. His formally talkative and affable nature completely disappears, and he drastically changes into a cold man keen on delivering corporal punishment for the minor mistake. It's also possible that Baldi's mental stability is only seen when people follow what he wants. He slaps his ruler in his hand like some sort of compulsive habit, and slowly but surely chases his quarry, growing faster the angrier he gets. After collecting notebooks, he gives students a chance to leave the school, albeit in a limited time span and laughs at their escape efforts. It is unknown if he is a psychopath or sociopath, but given he manages a school, the former is more likely. cit http://baldis-basics-in-education-and-learning.wikia.com