>>149131876
Just saw this, sorry. It's the scrapped ORGINAL antagonist of the first movie, Xerek. You can find a lot of pieces of concept art with him, syndrome becoming the main villain happened relatively late into development as there still pieces depicting Xerek with Mirage's final look.
https://www.tumblr.com/jessalynlearns/177255851235/xerek-the-incredibles-og-villain