If you ask me, he should totally make Thanos the estranged brother of Darkseid. Besides, Thanos would be more feared than the Darkseid, because he seeks the Infinity Stones, which are more powerful than the Anti- Life Equation.
His name is Dark Eagle, and he is pure evil. He hates his own kind for murdering his family when he was only six. And the promised him his revenge is the Mad Titan himself. After years of training under him, Thanos turned his wings as black as the night, and gave him Thanagarian armor. the helmet/mask had to come from the severed head of Thanagarian, which Dark Eagle gladly decapitated.
I was also thinking Proxima Midnight could be a former member of the Female Furies of Darkseid before she joined the Black Order of Thanos.
The way Dark Eagle uses the Thanagarian's severed head as a helmet/mask reminds me of how the Man-Hawks remove the skin off people's faces and wear them as masks. "Face your enemy with the face of your enemy."
I know. Dark Eagle is basically a broken soul who was lead astray. He eventually became leader of the Black Order. In his time terrorizing Earth under the guise of an American terrorist, he was eventually brought down by my OC character, Nighlock, a mutant with adaptation powers and he wears a Cybertronian armor. Nighlock's a teenager with great intelligence.