Biff Howard Tannen
The primary antagonist across multiple time periods. Biff is a bully who torments the McFly family across generations, representing the consequences of unchecked aggression.
Personality
Abilities
Dr. Emmett Lathrop "Doc" Brown
An eccentric scientist and inventor who creates the time machine. Doc is brilliant, enthusiastic, and deeply cares about the consequences of time travel and scientific responsibility.
Personality
Abilities
"Great Scott!"
Dr. Emmett Lathrop "Doc" Brown
An eccentric scientist and inventor who creates the time machine. Doc is brilliant, enthusiastic, an...
Abilities
George Douglas McFly

Marty's father, initially a timid and insecure man who transforms into a confident writer after Marty's intervention in the past.
Personality
Abilities
Martin Seamus "Marty" McFly
A typical 1980s teeger who becomes an accidental time traveler. Marty is resourceful, brave, and loyal to his friends and family, though sometimes impulsive when called "chicken."
Personality
Abilities
"This is heavy, Doc."
Martin Seamus "Marty" McFly
A typical 1980s teeger who becomes an accidental time traveler. Marty is resourceful, brave, and l...