The Mule is an enigmatic, highly capable mutant warlord who rapidly conquers planetary systems with an unexplained ability to subdue populations without firing a shot. Magnifico is a frail, anxious street clown who claims to have served as the Mule's court jester before escaping. Together, the unseen conqueror and his terrified former servant represent the central mystery of the Foundation's greatest crisis.

Bayta is a smart, direct Foundation citizen with a degree in history. She chafes at the greedy despotism of the Foundation's current rulers and remains one of the first to doubt the infallibility of psychohistory. Her bold intelligence often drives the group's decisions as they investigate the mysterious threat facing their civilization.

Hari Seldon is the legendary founder of psychohistory who established the Foundation three centuries ago. Though long dead, his mathematical predictions shape the destiny of the entire galaxy, reducing a 30,000-year dark age to a single millennium. He represents the belief in an orderly, predictable universe.

Bel Riose is a brilliant, ambitious young general in the decaying Galactic Empire. Stationed far from the capital, he seeks military glory to combat the lethargy of the Imperial court. He believes strongly in individual free will and actively tries to outmaneuver the predetermined paths of psychohistory.

Lathan Devers is a tall, bearded, and jaunty Trader representing the Foundation. Underneath his breezy, unconcerned exterior, he acts as a spy gathering intelligence on the Imperial armada. He relies on fast talking and quick thinking to survive his captivity.

Ducem Barr is an elderly scholar and former Imperial functionary living on the remote planet of Siwenna. He harbors a deep hatred for the Galactic Empire due to a past massacre that decimated his family. He relies on his historical knowledge of Hari Seldon to survive Riose's dangerous demands.

Ebling Mis is the Foundation's most brilliant and essential psychologist. He is famously cantankerous, frequently using heavy profanity, and shows absolutely no respect for political authority. He dedicates himself to recalculating Hari Seldon's equations to prepare for an upcoming crisis.

Toran is a young Trader born on the planet Haven II. Having grown up in the shadow of his adventurous father, he possesses a somewhat timid disposition but firmly believes in his wife's ideals. He provides steady support as they travel the galaxy investigating a new military threat.

Han Pritcher is a tall, capable captain in the Foundation War Department. He is a man of action who despises bureaucratic red tape, frequently ignoring direct orders to investigate what he perceives as genuine threats. He secretly works with the political underground to resist both the Foundation's tyranny and outside invaders.

Cleon II is the aging Emperor of the Galaxy. He has presided over a shrinking but relatively peaceful domain for decades. Constantly threatened by ambitious sons and generals, he relies on his unpopular secretary to maintain a tight grip on his crumbling power.

Brodrig is Emperor Cleon II's secretary and closest advisor. Widely despised by all factions in the Imperial court, his universal unpopularity makes him perfectly dependable to the emperor. He is ruthless, opportunistic, and entirely focused on maintaining and expanding his own power.

Randu is a thoughtful, quiet leader on the Trader planet Haven II. Unlike his boisterous half-brother, he takes a careful, political approach to resisting the Foundation's growing dictatorship. He recognizes the danger of the mysterious new warlord and actively recruits his family to gather intelligence.

Mayor Indbur III is the bureaucratic ruler of the Foundation, having inherited the position from his dictatorial father and grandfather. Lacking their ruthless competence, he obsesses over minor administrative details and believes completely in the invulnerability of the Foundation.

Franssart is a one-armed, larger-than-life veteran Trader from Haven II. He enjoys regaling listeners with tales of his past adventures and harbors a deep resentment for the Foundation's current oppressive leadership. He is fiercely protective of his family and planet.

Sennett Forell is an extremely wealthy Foundation leader and trader. Widely believed to be the illegitimate son of a famous past leader, he holds significant unofficial power and advocates for proactive espionage against Imperial threats.

Onum Barr is an exiled Imperial senator whose historical encounters shape the current conflict. Decades ago, he met a mysterious trader who introduced early Foundation technology to Siwenna, leaving behind a personal force-shield.

Mori Duk is a large, enthusiastic, but gullible Imperial sergeant serving under General Riose. He is easily manipulated by his prisoners, accepting bribes of modern conveniences in exchange for information.

Lee Senter is the leader of a local agricultural tribe, known as the Group, living among the metallic ruins of the old Imperial capital. He trades scavenged metal for supplies and holds deeply traditional views on social hierarchy.

Jord Commason is the wealthiest individual on the agricultural planet of Neotrantor. As a counselor to the crown prince, he is a scheming and ambitious man who views every new arrival as an opportunity to gain leverage or extract valuable information.

Inchney is an aging, powerless man who once held the title of Imperial lord. He now serves as a chauffeur to the wealthy Jord Commason, offering cynical advice about political hostages based on his past experiences in court.

Dagobert IX is the absent-minded son of the last Galactic Emperor. Ruling over a mere handful of agricultural planets from Neotrantor, he is entirely senile and disconnected from the harsh reality of his family's lost empire.