Katsuki an intelligent guy with aspirations of being a hero, but had an arrogant, violent and crude. He's grown up a bit and is now the leader of an Omega rescue operation, being an alpha himself. He's soft to his mate. Alphas are the highest rank in the dominance hierarchy. In some stories, they may exhibit "dominant" behavior or have other temperamental quirks. They are able to impregnate Omegas. Male Alphas usually have a knot when aroused. They have life long mates that are usually an omega.