He is a giant sentient fork who is the boss of several companies found throughout the Mushroom Kingdom. He could either be a boss or a waiter and is often seen as an enemy of Mario, serving as a foil to him.
Jeeves is an often cranky guy who seems like he cares only about honour 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 is also somewhat of a perfectionist, as indicated by his refusal to be seen wearing stained clothing (despite the fact that no one would mind and he could simply wash it off), as well as his insistence that only the best players can join the Tennis Aces. He is shown to like artistry, since he made Toadsworth a painting of him as a parody of the famous Mona Lisa.
He seems to paint himself as a gentleman, when sometimes, he is presented as anything but. He is incredibly short-tempered and when frustrated, he will get extremely bossy, cruel, and punishing, as shown by his treatment of cows in SMG4: Mario Goes to the Fridge to Get a Glass Of Milk, making it impossible for SMG4 and friends to reason with him.
His temper is so great he attacks anyone who commits even the slightest offence against him, such as Mario accidentally staining his clothing (as stated above), the Mario Bros. and Toad trying to steal his milk and failing to get a tank full of it by dawn, causing him to attack and threaten to spank poor Luigi, destroying Mario's lemonade stand purely because Mario had "insulted" his milk company by building his stand next to his MooMoo Milk restaurant, and in SMG4: Stupid Mario Golf, forcing SMG4's gang (including Fishy Boopkins and Bowser Jr, who are only children) to go through increasingly taxing and punishing challenges purely because of their failure to get a single golf ball despite it not being their fault, to the point he summoned the "Demi-God" Matt to kill all of them. Although he likely holds all the members of SMG4's gang in contempt, he especially hates Mario, who despite being annoying and hopelessly stupid, usually does not intend to get in his nerves, unless Jeeves angers him first.
SMG4: Stupid Mario Golf reveals him to be bloodthirsty, especially when irritated. When he sees that the competitors aren't making any good progress, he keeps changing the rules to be more chaotic to the point where he outright wants everyone to beat each other up. When they refuse to do even that, he decides to unleash Matt on them, confirming that he purely hosted the golf competition for his own entertainment.
- Influence of leaders: Jeeves is so serious about his jobs that he can instruct each of his employees so well that they do whatever Jeeves wants.
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.
He appears after being called by Tari where he suggested using a rope to pull Fishy Boopkins out of the well. Although the idea was working, Mario let go due to seeing a quarter, causing it to unravel.
In this episode, he appears as the boss of the Moo Moo Milk company. He is also shown to be a cruel boss who ordered overworking on Steve's cows just so they could give him milk.
Jeeves opposes Mario's efforts to sell lemonade, as he has located his lemonade stand close to his milk café.
Jeeves appears on line at the bank and gives Mario a Rubik's Cube to stop pestering him after slowly getting irritated by him. However, Mario ends up choking on the cube and coughs it up, causing the cube to deflect from a pillar and hit Jeeves, throwing him out of the building.
Jeeves appears at the beginning of the blooper, wanting payment from Mario for using his taxi. However, Mario (who wants to use the taxi to start his own business) dupes him with fake money, enraging him.
He later appears at the end of the video, knocking out Mario with another car and taking the plumber's money before telling him that the events of the video should be a lesson for him, ruining Mario's entire scheme to gain money.
Jeeves was the host of his golf tournament. He started getting so annoyed at the contestants for not playing golf "properly", to the point of sending Matt to take them out. But when Matt remembered his origins, he decided to spare them, and turned Jeeves into tickets to Brazil. What happened to Jeeves after that is unknown.
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 demoted 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 does not properly speak in this season; with his only dialogue being sourced voice lines.
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 in SMG4: Mario Gets【Ｗｏｋｅ】. 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 appearance was in SMG4: If Mario Was In Meta Runner and his sixth was in a storybook video in SMG4: Meggy's Part-Time Job. His final appearance in the season is a cameo in several segments of SMG4 2020 COLLAB SPECIAL.
- Jeeves has much less screen time and appearances than any other original character, only appearing nine times in his debut season and six times in Season 9 (seven if the hallucination in SMG4: Mario Gets Stuck On An Island is counted). He was then reduced to a background character in Season 10, appearing only in cameos with no speaking roles.
- According to SMG4: Mario's Lemonade Stand, he was Baldi's student in spanking.
- It is possible that he was named after Jeeves from Jeeves and Wooster.