As i'm sure SOME of us remember from the old Batman Animated Series, the Clock King Tempus Fugate (or better known as his comic incarnation, William Tockman), manages to outright foil and nearly kill the Caped Crusader on three seperate occasions, renaining a staunch ally of Amanda Waller and the Suicide squad, and playing a substantial role in the creation of Terry Mcginnis, otherwise known as Batman Beyond.
Why don't we get more villains like this? No gear, no powers, just intelligence, efficiency, and research.
Thus, an ode to all villains of this nature.