Here are some MHA-style villain names, categorized for different vibes:

Intimidating & Powerful:

• Overlord Nox: Evokes a sense of supreme darkness and control.
• Malak the Unbroken: Suggests resilience and an indomitable spirit.
• The Obsidian Tyrant: A powerful, visually descriptive name.
• Lord Imperius: Classic villain name, suggesting absolute power.
• Seraphina the Fallen: A fallen angel, hinting at betrayal and immense power.
• Nemesis Prime: A name suggesting ultimate rivalry and destruction.
• Grand Admiral Vashta: Suggests a high-ranking military leader with sinister intent.
• The Crimson King: Simple, yet evocative of bloodlust and royalty.
• Deathbringer: Straightforward and menacing.
• Voidbringer: Suggests the ability to manipulate nothingness or emptiness.

Cunning & Manipulative:

• Silas the Shadowbinder: Suggests control over shadows and deception.
• Whisperwind: A subtle, yet ominous name hinting at unseen manipulation.
• The Serpent's Kiss: A dangerous and alluring name.
• The Puppet Master: Classic villain archetype, clear and concise.
• Dr. Enigma: Suggests intelligence and mystery.
• Nightshade: Poisonous and secretive.

Quirky & Unpredictable:

• Gigglefang: A jarring contrast between childish and menacing.
• Professor Chaos: Suggests chaotic plans and unpredictable actions.
• The Jester of Doom: A darkly comedic villain.
• Madcap Mayhem: Energetic and chaotic.
• Flutterby the Fiend: A deceptive and unsettling name.

Nature-Inspired:

• Nightshade: A poisonous plant, suggesting danger.
• Magma Maw: Evokes images of volcanic destruction.
• Stormcaller: Suggests control over storms and weather.
• Earthshaker: Powerful and destructive.

Technology-Based:

• Circuit Breaker: Suggests the ability to disrupt systems.
• Data Drain: Suggests the ability to steal information.
• Null Sector: A technologically advanced villain.

Remember to consider the villain's personality, powers, and backstory when choosing a name. These are just starting points; feel free to mix and match elements to create something truly unique.