Makemakeball, like many other KBOs, probably has a large ice content. He seems to be reddish in color, likely due to tholins.
Orbit - Rotation
His orbit is officaly highly inclined at 29° and has a moderate eccentricity of 0.16, which is actually less than Mercuryball's (0.21). Not much is known about his rotational period or his obliquity, but it is almost certain that he is not tidally locked to his only moon.
Credit to Redditor PaleoCardio