Keef

Keef is a rejected boy that attends Skool and was once friends with Zim. He is voiced by Danny Cooksey and by Isabel Martiñón in the Spanish dub.

Appearance
Keef is a small boy with a tuft of red hair on his head. He has large emerald green eyes and pale skin. He wears a light blue shirt with a rainbow print, along with black shoes and dark cyan pants.

Personality
While very kind, caring and friendly, Keef is overly attached and became obsessed with Zim after becoming his friend, and stalked the alien to the point of even entering his house without permission. Like most humans, he is rather oblivious and gullible, as seen when he failed to comprehend Zim's meaning behind the statement that Keef had "fulfilled his purpose" as his best friend. Moreover, Keef expressed no surprise at GIR's ability to speak, despite his apparent canine nature. His fixation on Zim seems to know no bounds: When Zim attempted to avoid contact by feigning sickness, Keef decided to hold a surprise party in Zim's own house to cheer up his "best friend." This proves to be a costly mistake.

Role in Invader Zim
In the episode "Bestest Friend", Keef actually served as a main character. He was used by Zim as a best friend (due to his physical absorbency of liquids, shock-resistance, and ability to come out all right after an incident with a toy beaver and taxi) so that Zim appears normal to the other Skoolchildren. However, Zim grew tired of Keef following him everywhere and invading his privacy. Ultimately, Keef's stalking proved to be a threat to Zim's mission, so he devised a plan to get rid of him; he handed him a package that contained robotic hands that ripped out his eyes and replaced them with robotic ones.

After doing so, Zim hypnotized him so that the first living thing he would see with his new eyes he would believe to be Zim. Unfortunately for Keef, the first creature he saw happened to be a particularly territorial squirrel. Enraptured, Keef chased the squirrel onto Zim's roof, where it finally attacked him, causing him to fall from the roof and get caught in some sort of explosion. Keef is one of the few characters (along with Dib and Gaz) to fully acknowledge GIR's presence.

After "Bestest Friend", Keef served mainly as a background character. His most notable background appearance was in "Halloween Spectacular of Spooky Doom", where a version of him was seen in the nightmare world with the other monsters, but looked exactly the same; this was because, as Jhonen jokingly stated in the DVD's commentary, "He was already scary enough to begin with".

It was planned in "Return of Keef" for him to make another appearance, but due to the cancellation, the episode was not complete. In this episode, Dib was going to use Keef to defeat Zim, but he failed. Even though this happened, Keef tried to get Zim and Dib to be friends (not knowing or perhaps caring that they hate each other). Putting their differences aside, Zim and Dib were to pretend to be friends to get Keef to blow up from happiness after being splashed with Zim's latest experiment, emotional explosion solution. They succeeded, but Nickelodeon's editorial team would've most likely objected against killing Keef (as they did with Jhonen's intentions to non-graphically kill Iggins), so he affirms that he is okay before fainting from the whole ordeal. In this episode, Zim would have revealed that he was an alien in front of Keef, but it is unlikely that he really cared. He would then be the only other human who would've known this besides Dib and Gaz. This is also the episode in which Keef knows that Zim was being a jerk before ("If I make him happy, maybe he'll let me come near him again, without taking my organs out! Yay!").

Keef reappears in Issue 15 of the comic series, as one of the students who shares their theory of what Ms. Bitters' origin might be. Specifically, he thinks that she's a member of a secret society of evil-doers, assigned to the skool to make children miserable.

Facts of Doom

 * Meef, the boyscout from "Backseat Drivers from Beyond the Stars" is supposed to be Keef's younger brother.
 * Unlike most Earth children, Keef (rather mysteriously) only has three fingers, the same number as Irkens.
 * Like Tak, he plays a major role in a single episode and afterwards only makes small cameos, yet is quite popular among the fandom.
 * He is very absorbent, as shown in "Bestest Friend", and also extremely conductive, shown in the same scene.
 * Keef is the only human who calls GIR by his name.
 * According to the director's commentary for "Bestest Friend," Keef's character was inspired by a Nickelodeon employee named Heath (surname unknown) who kept "leeching onto Jhonen" while he was working on the original pilot.
 * During "The Most Horrible X-Mas Ever", Keef is seen with blond hair, most likely an animation error.
 * Had the series continued, Keef would have learned that Zim is an alien but it's likely that he either wouldn't have cared or would forget that.