There are three types of Omega in the ABO. The first one is, an ordinary Omega. They can seduce alpha, can also seduce Beta male but they can't feel the emotions through pheromones if they aren't marked by their alpha. The second is the Dominant Omega. They can both seduce Beta male and Alpha, can also feel the emotions through pheromones, and can also reject the seduction of the other alpha except their own alpha. The last one is the Recessive Omega. These Omega has the pheromone disorder syndrome. Alphas can't be able to detect and smell their pheromones. They aren't also affected by alpha's pheromones unless they like the alpha who emits pheromones.