Escafarc

Here's a pair of original villains by Dan Houser (line artist for the rpg ICONS). A brother & sister duo known as Frostbite & Sunburn:
 

 

Doctor Dracula, another Nazi agent who fought Captain Battle:
 

 
A revision to the Golden Age Hero known as Man of War: 
 

A pair of public domain characters done by an artist named Richard Spake:
 
The first villain is Blackout, a Nazi agent & Saboteur who strikes during blackouts. Highly skilled person who uses a gun, knife and has a gang of thugs to work for him. Also uses explosives when necessary. 

The second is The Red Knight. He ran afoul of the original Blue Beetle:

Black Lotus

Jiang