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He is a giant sentient fork who is the boss of several companies. He could either be a boss or a waiter and is often an enemy of Mario.
Jeeves is a cranky guy who seems like he cares only about honor and dignity, but he's also very interested in money, as we see when Donkey Kong asks him to kick out all of the other customers in the restaurant so that he and Pauline, DK's date, can be alone. At first, Jeeves politely denies DK this request, but when he's bribed with a bag of coins, he eagerly obliges.
He's also somewhat of a perfectionist, as indicated by his refusal to be seen wearing stained clothing, as well as his insistence that only the best players can join the Tennis Aces. He is shown to be an artist since he made Toadsworth a painting of him as a Mona Lisa parody.
He may also not care about personal safety, as shown in SMG4: Mario And... The Well when he interrupted Shroomy's instructions.
He is shown to be a math teacher although he quits early on although it is understandable as he had tried five times with teaching Mario math but they all failed.
He is shown as a referee for tennis and as Waluigi's coach in training him for the Aces tournament.
He is shown as a painter painting a picture of Mona Toadsworth, which was just the Mona Lisa with Toadsworth's face on it for his friend.
He is shown as an on-site journalist during the GlitchCon incident and the T-Zombie pandemic. He naturally gets infected and turned into a T-Pose Zombie subsequently.
In this episode, he appears as the Moo Moo Milk factory boss. Apparently, he is also shown to be a boss who ordered the overworking on the cows to give him milk.
Jeeves opposes Mario's efforts to sell lemonade, as he has located his lemonade stand close to his milk cafe.
Jeeves appears on line at the bank and gives Mario a Rubik's Cube to stop pestering him, but Mario ends up choking on the cube and coughs it up, causing the cube to hit Jeeves and throw him out of the building.
He appears at the start wanting payment from Mario for using his taxi. However, Mario dupes him with fake money, enraging him.
He later appears at the end of the video to take Mario's money before telling him that whatever happened in the video should be a lesson to him.
Jeeves appears in SMG4 Christmas 2018: The Most Important Thing as an example to Bob Bobowski of having someone to spend Christmas with, in his case Toadsworth, hosts a cooking challenge in SMG4: 3 MILLION SUB FAN COLLABORATION!, and attends Desti's funeral along with Shroomy but does not talk in SMG4: Final Hours.
After Season 9, Jeeves was reduced to a background character. His role of a proper, nagging authority figure has been given to Hal Monitor in the first half of the season and Peach Toadstool after The YouTube Arc.
He returned in SMG4: Mario VS Siren Head trapped in a burning building that the Woomy Fire Brigade was putting out. His second appearance that season was when Mario used him and several other characters as bowling pins when he accidentally froze time with the YouTube Remote. His third appearance was in SMG4: A Totally Normal S̷͍͖͉̙͚͎̑̃̿͑̆̇̚͠M̸͇͇̦̮̌̿Ğ̴̫̗̖͎͔̳4̶̞͇̰̎̀́̚ Episode, when Mario was escaping a horde of Oof Buttons summoned by SMG3 by throwing Jeeves into one of the button's eyes. He appeared again in SMG4: Mario Scratches His Ass when Mario used him as a buttscratcher. His fifth appearence was in SMG4: If Mario Was In Meta Runner.