Even if a villain allows their lackeys to do all the dirty work, that doesn't mean they're just sitting back and doing nothing. Running the show requires a lot of hard work, and the villains in anime are certainly hard-working. From Reiner Braun in Attack on Titan to Code Geass' Lelouch Lamperouge, several anime villains have a lot on their plate.
Lelouch from Code Geass isn't physically strong, but he makes up for it with his intelligence. He's an excellent student, but the moments he pushes himself the hardest are when he's acting as Zero.
Lelouch can control an entire battle like a chess game, and his strategy leads the Black Knights to victory. Even after losing a fight, Lelouch can pick himself back up and re-strategize. It's hard to believe Lelouch is a teenager, considering he can amass a legion of followers and gain control of all Britannia.