XLR8 (pronounced X-elerate) is the Omnitrix's DNA sample of a Kineceleran[7][8] from the planet Kinet.[Bandai 1]

XLR8 resembles a semi-armored Velociraptor. He has black orbs on his feet, a black tail with five blue stripes, and bulky claws on his three fingers that can only open and close. He wears a black cone-like helmet with a protective visor that slides over his face (that is part of his Kineceleran biology and not mechanical).[pop-up 1][1] When the visor is lifted, one can see his blue face, green eyes, black lips, and stripes running under and in between his eyes; the rest of his head's features are unknown. XLR8 wears a black bodysuit and turtleneck-like shirt with a white stripe on the center.

In Back With a Vengeance, XLR8 wore a yellow raincoat.

In Ultimate Alien and Heroes United, XLR8 looked exactly the same as he did in the Original Series, albeit his skin was slightly darker, and he was more muscular.

In Omniverse, XLR8 is now taller and the white color on his shirt is replaced with green, which now covers his neck. The number of tail stripes have gone down to four, the black balls on his feet are bigger, and his visor is darker.

11-year-old XLR8 in Omniverse looks exactly the same as his 16-year-old self, except that he is shorter, and the green color of his shirt is white. He has three stripes on his tail.

In Rules of Engagement, XLR8 wore jewelry Fistina had stolen.

XLR8 wears the original Omnitrix/Ultimatrix/Omnitrix symbol on his chest.

Ben 10,000 as XLR8Ben 10,000's XLR8 was taller and more muscular-looking than his 10-11/16-year-old self. His arms, legs and tail stripes were white instead of blue, and there were less stripes on his tail. XLR8's clothing had longer sleeves with a pair of stripes under the shoulders and has an arrow-shaped symbol on his lower torso. He wore the Omnitrix symbol on his chest.