alexis kerib
The main anthagonist from SSSS.Gridman. He is a being that came from void dimension, due to his origin, he is completely immune against all kinds of attack.
Alexis "offered" Shinjou Akane a helping hand to "managing" the world she created via using his power to transforming Akane's sculpture into kaiju.
His goal is collecting negative energy from Akane as well as destruction of the cyber dimension.