Mixmatch Monsters are the new kind of monsters. They are Special Summoned by Mixmatch Summon, using two Mixmatch Material monsters. The color of their card frame is purple similar to Fusion Monster card frame.
They were have similar elements of Fusion Monsters. Unlike Fusion Monsters, The Mixmatch Monsters does not have Polymerization requirement, instead you can fuse their own. The Mixmatch Monsters have Levels, but also has Ranks.