Abnormals are human beings who surpass human limitations and possess unique powers that we call magic. These individuals can either be born as Abnormals, inheriting their abilities as descendants, or they can become Abnormals through extreme means.
For now, we will focus on the Vestian Abnormals who wield the Parrot's Power. Even if a few inherit the same Parrot's Power, they can still develop different types of powers unique to them.
As for more information, you'll have to wait a few more chapters...