T.K.O. and K.O. Combined (or Halfsies by K.O.) is the result of K.O. and Turbo K.O. sharing a body, though not in an efficient manner. He made his first appearance in the episode "T.K.O.'s House". He possesses both of K.O. and Turbo K.O.’s powers; however, they are not merged but instead correspond to either side of the body. Combined K.O.‘s movement is very erratic and random, to the point where even standing up correctly took a great deal of effort. He is not to be confused with P.K.O., who makes his debut in the same episode.
As the name suggests, "Combined" K.O. is half K.O. and half T.K.O. His right side has the characteristics of K.O, like his normal hairstyle, a brown eye, and red wristband. "Combined" K.O.'s left side is similar to T.K.O, with the hairstyle being somewhat spiky, a purple eye, a purple spiked wristband, purple eyeshadow, and painted nails. His legwarmers are two different shades of pink, the right side being like K.O.'s shade of pink, while the left is a duller shade. He still wears the same blue vest, white tank top, red headband, and dark blue shorts that K.O. regularly wears.
His appearance can turn more K.O- or T.K.O-like or a combination of them at his will. In "Dark Plaza", when he tried to re-stabilize to P.K.O while controlling Plazamo to the limit, his transformation randomized and made them bipolar-like until he became unconscious.
Like physical appearance, Combined K.O.'s personality is divided in half between his two components. His right side reflects K.O.'s personality: nice, friendly, and a pleasure to be around. On the other hand, his left side is just like T.K.O.: mean, rude, and maybe even vulgar sometimes.
- His, along with P.K.O.'s, names aren't listed in the credits.