Not to be confused with KAZR.
ZAKR (or Zim and Keef romance) is the romantic pairing of Zim and Keef, one of Zim and Dib's human classmates. Keef passed, if not aced all of Zim's tests for best friend worthiness: absorbency, electrical conductivity, and whatever it was that took ten minutes as well as a beaver and a toy taxi. From that moment on, Keef has shown incredible loyalty toward Zim to an obsessive and almost fanatical degree, to the point of breaking into Zim's house and cooking him breakfast.
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Keef passing Zim's tests.
In Bestest Friend, when Keef and Zim first became friends, Keef hugged Zim out of joy; however, after Zim told Keef not to touch him, Keef respected this request and never physically touched Zim again (at least, not on purpose; he later accidentally bumped Zim while walking through the hallway.)
Keef's many shows of friendship. Note that Zim starts off fairly happy.
Later, when the class was working on art projects, Keef shows off an incredibly detailed, renaissance-esque portrait of himself holding Zim; something that would have taken not only a remarkable level of skill but an extraordinary amount of effort.