Choujins are a race of superhuman beings (Most of them Male) with superpowers and a unique form of Wrestling. Choujins are either born with powers and their abnormality or have them bestowed upon them later in life. In a few cases, some Humans or Extraterrestrials have become Choujins.
Your average Choujin could be as smart as a Human, but has several ways of tricking his/her opponent into a move they plan on using or revealing the latter's. In some cases (Namely King and KID Muscle), they could seem quite uneducated inside the fight or out.