The main character you play as. He is a kid who grew up in the circus always being pushed by his dad to train day after day.
His dad hated Psychics due to the group of them that put a curse on Raz's family. They were cursed to all die in water. For this reason, Raz is unable to go in any deep water and there is always a crazy monster lurking below ready to kill him. Secretly, Raz thinks that his dad was also a Psychic.
Because of this pressure to train for the circus everyday, Raz actually runs away from the circus and joins the Psychonauts' summer camp and that is where the story takes place.
The leader of the Psychonauts camp. He treats the camp as if its a military camp.
Ford Cruller was kind of like the leader of the Psychonauts, however due to some problems a few years back he has basically lost his mind and the Psychonauts will no longer work with him. When he is down in his sanctuary his mind stays safe because of all the Psitanium around him, but above ground is a different story.
He is a sidekick of sorts to Raz, stowing away in Raz's head and helping him out with his adventure.
One of the head Psychonauts at the camp. He is very calculated. He runs semi-dangerous experiments and training sessions with students. He has built a machine called the "Brain Tumbler" which allows you to get into different people's minds.
Milla is the other big Psychonaut at the camp. Her and Sasha share the duties that Cruller can not do. She's is a free spirit, a master of the mind, and the party. She normally hangs out over on the lake and shares with you the great power of Levitation.
Lungfish is basically a giant misunderstood fish. She looks pretty creepy and comes up on the beach at night to eat whatever is in the way. But is that her real personality? Or is something causing her to act this way?
Boyd is stuck in a nightmare town where there is a huge conspiracy going on revolving around the Milkman. Who is the Milkman? Where is the Milkman? What do you know about the Milkman? His vision of a town is crazy and twisted, literally, there are all kinds of people working all over town to figure out who the Milkman is and they will arrest you if you trespass in their zones.
Fred is the brother of Napoleon and they are both stuck in a game of "war." Fred has no motivation to win and Napoleon is constantly bothering him about the past of their family and how they were all winners, Fred really just doesn't care though.
Gloria used to be a famous actress but is now having quite the breakdown. She just can't seem to move on with life. There is some sort of Phantom inside her head haunting all of her plays.
Edward is quite the artist, but the little town in his mind is haunted with a giant raging bull. All he wants is to reach the girl up in the sky, but he can't build a card tower high enough to reach her. Part of the problem is that he is missing all the Queens to his card deck.
There are lots of other kids at camp that have funny personalities. You can talk to them when you see them throughout camp.
Dr Loboto is a dentist that has a claw for a hand, and a habit of stealing brains from the campers.