There are 3 more different types of KBO's in the Kuiper Belt. They include "Resonant" and "Scattered" KBO's along with an unnamed object. Plutinos or also known as Resonant KBO's are a common object to see closer to Neptune. They are referred to as Plutinos because, what do you know, Pluto is a resonant object, because it is under the influence of Neptune. These objects follow different resonances of Neptune, the plutinos are a 3:2 resonance and they orbit 2 times for every 3 Neptune orbits. This also happens with other KBO except they are in a 2:1 resonance and generally speaking rest farther away from the sun than the 3:2 KBO's. A Scattered KBO was also under Neptune's influence, but these objects got too close, resulting the KBO to go off into a "scattered" orbit. The orbit becomes crazy and the KBO's end up orbiting closer then Neptune at some points and can even send them hundreds of AU away also.  The very last type of KBO known is one that might not even be legitimate. Only two objects have been found alike thus giving scientists hesitance to name it a "type".  These KBO's orbit so far away it is unknown whether there are more, they never get closer than 76 AU and can orbit as far away as 1000 or more AU. Another very interesting sub category of KBO is called the "Binary KBO" they are relatively similar in size and they orbit each other. These are especially interesting because the formally known 9th planet is a Binary KBO. Pluto and Charon orbit each other, and it is unknown which is the moon and which is the KBO.  This is a relatively common thing to happen with these objects.

These are different Kuiper belt objects compared too other objects in the solar system.

http://pluto.jhuapl.edu/Participate/learn/What-We-Know.php?link=The-Kuiper-Belt