Teacher is the entity that runs the ICANSEETHEGIANT YouTube channel. He is also the one who nominated the three candidates in his riddle game.
Teacher is a tall, thin, featureless, black, and seemingly naked male entity. His behavior seems to vary between becoming deranged and almost human-like characteristics.
His voice is also another characteristic that varies according to emotions. His voice sometimes resembles growling and screeching that is unnatural, and sometimes closely resembles a human male's voice. This is rumored to be related to the titles of the videos he uploads, which start with capital letters and end in lowercase letters.