Here are some badass name options for an anti-hero, categorized for different feels:

Ruthless & Cynical:

• Revenant Thorne
• Seraphina "Viper" Blackwood
• Silas "Reaper" Graves
• Malachi "Nightshade" Stone
• Vex'ahlia "Shadowclaw"
• Crimson Dawn
• Ironheart

Mysterious & Brooding:

• Zephyr Nightsong
• Lysander "Wraith"
• Nyx Shadowwalker
• Kael "Obsidian"
• Raven Blackwood
• The Silent One
• Asher "Ghost"

Charismatic & Dangerous:

• Jax "Renegade"
• Seraphina "Tempest"
• Damon "Rogue"
• Valkyrie "Storm"
• Rhys "Phoenix"
• Scarlet "Viper"
• Lord Volkov

Brutal & Powerful:

• Ragnar "Bloodfist"
• Atreus "Breaker"
• Magnus "Ironclad"
• Khelgar "Stormbringer"
• Gideon "Skullcrusher"
• Brute
• The Mauler

Cunning & Manipulative:

• Julian "Whisper"
• Seraphina "Shadow"
• Lysander "Fox"
• Cassian "Trickster"
• The Serpent
• The Architect
• The Puppet Master

Remember to consider the anti-hero's backstory, powers, and personality when making your final choice. The best name will enhance their character and leave a lasting impression.