From the demons of this class seen in the series, A class are the traditional depiction of demons, with some being humanoid with various inhuman features such as horns, fins, eyes, etc; to very humanoid beings. From what is observed from the series, A class do not react to instinct, but instead, will use their brains and "senses" in order to judge how strong an opponent is and observe before taking action. As shown, when the first true A class demons that are shown in the series, are shown watching C class (probably more likely D class) gather in mass at the open Keikai barrier to enter the human world, commenting on the simplicity of their lesser brethren, while sensing the overwhelming powers of Sensui, Kuwabara, Hiei, and Kurama in his Yoko form, leave before they become involved in the