The Dink Network

Fusoya and Zeromus have disturbingly similar concept art!!

They're supposed to, they're both Lunarians in FF4. As are Golbez and Cecil.
FuSoYa works for the light, Zeromus for the Dark, basically. Simple opposites concept.

I wouldn't consider Zeromus to be a Lunarian, or any race for that matter due to him being the Hatred of Zemus.

I wouldn't recognize either of those characters by looking at the concept art alone.

I hate FF