Mr. Hall Monitor, also known as Mr. Monitor, is a security guard debuting as the main antagonist of SMG4: Mario School Club.
He is a tall, thin man with a computer monitor for a head. He wears a traditional security guard uniform.
Despite appearing kind and normal, whenever he sees or hears disorder, he shows his true colors as a psychopathic mood-swinger who hates any type of disorder or illegal activity and will give out severe and gruesome punishments to anyone who does so, which includes tearing out genitals and organs and blowing victims up, sending them to the sky burning. He also attacks people whose crimes are justified or are incredibly minor issues (examples being when Wario was going to get across the street when there was a red light and Bob insulting him and the school).
When SMG4 attempted to leave the school despite Mario's warnings (since they were trespassing), the guard, upon noticing him, made several disturbing faces and repeated his words over and over as he begins to chase SMG4 back into the room for trespassing. He later overheard the commotion in the room when Mario accidentally summoned Satan and reveals to tear apart the genitals of people who commit disorder, as evidenced by the quote "I don't want to tear another anus today." It is only by Mario and Bob pretending to be a student and a teacher respectively that Mr. Monitor leaves and goes back to his shift.
At the end of the episode, when Bob insulted the school and Mr. Monitor by saying he "can go suck a chode", the guard barged into Peach's Castle and threatened not only Bob but the rest of SMG4's Gang with a bazooka.
He reappears in SMG4: If Mario was in The Sonic Movie after Mario writes "free candy" on Dr. Eggman's van, causing the guard to mistake Eggman for a pedophile and blowing him up (though due to Gmod physics, his monitor head is blown away by the explosion). His name is revealed to be Mr. Hall Monitor in SMG4: Mario's Magical TV where he promotes safety cameras.
In SMG4: Mario Commits Tax Fraud, Mr. Monitor arrests Mario for having committed tax evasion (granted, Mario never did any tax training in his life and said tax evasion was justified) and beats him up severely when he tries to escape via the sewers. After Mario and Yoshi escape the prison, Dovahklin attempts to warn Mr. Monitor, only for Yoshi to make him fall endlessly through portals with the Portal Gun. Yoshi then forces Mario into the Council of Tax Fraud, but after learning what its members do all day, Mario tries to quit, only to be captured and sentenced to execution by the leader, Beeg Yoshi. Mario is forced to call Mr. Monitor (who was strangling Wario for trying to walk across the street on a red light), to help him. Mr. Monitor easily dispatches the Yoshis and as a thank you to Mario for exposing the biggest tax evaders in the kingdom, allows him to go free. He, however, threatens to rip Mario's organs out should the latter commit any other crime.
He makes a brief appearance in SMG4: Mario Runs Out Of Toilet Paper, selling toilet paper. However, since the Mushroom Kingdom is running out of it, Mr. Hall Monitor only offers 1 roll per person. This results in a large line of customers desperate for toilet paper. Bowser can be seen getting choked for attempting to take more than a single roll, once again showing how serious Mr. Monitor is about rules. Mario tries to fool him by sticking a computer screen to his own face, attempting to look like Mr. Monitor's father. After making this claim, Mr. Monitor mentions that his father is dead, ruining Mario's disguise. Mario manages to escape the situation by splashing Mr. Monitor with water, making the computer head electrocute himself.
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