"Chaos Normal" monsters (CN. for short) are a group of Fusion Monsters that evolved from Normal Monsters via "Level-Up-Magic". Despite the fact that these monsters evolve from Normal Monsters, they have effects as well. Any Normal Monster that level-ups via "Level-Up-Magic" "Barian" cards will have origins from the Barian World themselves.
They are also Fusion Tuners monster that existed as well, but due to the fact that there are a few Normal Monsters that are Tuners, it is rare for them to be Tuners. When the "CN." Tuner tunes with a Synchro Monster, a new type of Synchro Summon is call Chaos Normal Vortex Synchro Summon