Alexis Kerib

The main antagonist of SSSS.Gridman, who is loosely based on Khan Digifier from the original Gridman live-action series.

He once fought Gridman, who was chasing him from the Hyper World, and won, having split up his conciousness into parts.

His ability "Instance Aberration" is able to turn Akane's monster sculptures into giant, real-life monsters.

His design is based on Over Justice, a character from Uchuu Patrol Luluco (who shares the same voice actor with Alexis), and Scourge (Black Convoy) from Transformers: Robots in Disguise.

(Source: Ultraman Wiki)