| Middle School Students (seasons 1 - 3)|
High School Students (season 4)
| Middleton Middle School (seasons 1 - 3)|
Middleton High School (season 4)
| James Possible (father)|
Ann Possible (mother)
Kim Possible (sister)
"Nana" Possible (grandmother)
Slim Possible (uncle)
Joss Possible (cousin)
| Ron Stoppable|
|No Known Love Interests|
|No Known Pets|
|No Known Nemesis|
|Behind the Scenes|
|Shaun Fleming (seasons 1 - 3)|
Spencer Fox (season 4)
Jim and Tim Possible are identical twin brothers, and younger siblings of Kim Possible, whom she calls "Tweebs"–a portmanteau of "twin" and "dweebs". They are distinguished by the major coloring of their clothing; Tim habitually wears red, while Jim wears green.
When they are not harassing Kim, they are making trouble with their scientific experiments and inventions such as launching rockets or sending out screensavers of an unsuspecting Kim to all of Middleton.
Jim and Tim are never far from each other and exhibit a high level of synchronization. Antagonistic, anarchic and brilliant, they have cared little for rules and restrictions on their activities, and rebelled against their older sister's attempts to rein them in. Like most twins, they have a set of invented twin-speak slang between themselves, with their trademark catch-phrases being "Hicka-bicka-boo?" and "Hoo-sha!" in response.
The twins were born sometime during Kim's pre-K year. Kim had been hoping for a baby sister, while her father jokingly but correctly suggested the possibility of twin boys.
Even at the tender age of ten, the twins constructed an array of amazing and often destructive devices, typically using parts made available by their father's experiments, or simply taking and breaking down various appliances from Kim's room. Though Kim generally resented them doing so, the twins occasionally contributed to her missions, and even managed to save her a few times. When Dr. Drakken stole a neuro-compliance chip and used it on Kim to make her his mind-controlled servant, it was thanks to the twins' invention of a handheld silicon phase disruptor that Kim was returned to normal.
Jim and Tim are nuisances at home, constantly chasing after their experiments run wild, or getting caught red-handed before they can do something questionable or potentially destructive. Despite the obvious headaches they cause their family, the twins' creativity is never entirely stifled, only momentarily contained long enough for the latest mess to be cleaned up. Though their father is annoyed when they borrow his work materials without asking, he still displays pride over their collective creative genius.
The twins greatly enjoy being regular headaches for Kim, but they do assist her with missions on occasion. After they enter high school, they become entirely responsible for the regular maintenance on Kim's car, the Sloth.
Jim and Tim briefly socialized with Bonnie Rockwaller, though on both sides this was mostly to momentarily antagonize Kim, and not an actual friendship. The twins later repaired Bonnie's car after it was destroyed, but once she broke their contract, they undid their labor and left her stranded.
Jim and Tim were mechanical and scientific prodigies. They spent the bulk of their time inventing, obtaining parts by breaking down household appliances or "borrowing" their father's work materials. While many of these inventions exploded, ran wild, or were halted in progress by others, a number of them reached completion and proved far more effective than those designed by older, more experienced scientists. The twins displayed a preference for regularly practicing in their father's field of rocket science, but also had considerable talent in automobile repair, despite no known formal training in either area. Their intelligence was high enough that they consistently proved smarter than children their age, students above their age, and even adults far beyond their age.
- silicon phase disruptor
- remote-operated containment field
- molecular transducer/smoothie maker
- Jimunnicator and Timunnicator
- grappling beam
- modified Lorwardian disintegration beam unit (collaboration with Ron Reiger)
- The boys can be told apart by their major color scheme. Jim wears green, while Tim wears red.
- Their voice was originally provided by Shaun Fleming who is known for playing Leonard Helperman in Teacher's Pet. Since their redesign, it has been provided by Spencer Fox who is best known for voicing Dash Parr in the Pixar movie The Incredibles.
- Their age is given in October 31st when they state that they are 10.
- In the German version they are called "Zwombies", a portmanteau of "Zwillinge" (twins) and Zombies.