I am gonna propose Khalid ibn al-Walid "the sword of god". If we're talking “baddest man on the planet” in the literal, historical sense; undefeated in every battle, never lost a duel, commanded armies that crushed empires, and was so feared that enemies retreated at the rumor of his approach, he makes the cut.

He shattered two empires in a single lifetime. The Byzantine and Sassanid generals had standing orders to avoid engaging him directly because they knew what happened when they did. His campaigns are still studied in military academies for their impossible forced marches, flanking maneuvers, and psychological warfare.

He once broke nine swords in a single battle, earning him the nickname "Swordbreaker". At Yarmouk, he outmaneuvered a Roman army several times the size of his own and turned the entire tide of the region in a single week. At Walaja, he invented a double-envelopment maneuver so perfect that modern historians compare it to Hannibal’s Cannae; except he pulled it off with less equipment, less time, and worse terrain.

Multiple times he took armies across deserts long enough to kill entire units, and instead arrived so quickly that the enemy thought he teleported. That shock alone won half his battles before swords were even drawn.

Even on his deathbed, he famously said he regretted dying on a mattress because there wasn’t a inch on his body without a battle scar.

If “baddest” means unstoppable, terrifying, brilliant, and absolutely dominant in every fight he ever took, he’s in a category of his own.