1. An unassuming appearance

-An elderly man rather than a young, physically imposing action hero.
-Relies on intelligence and experience rather than strength.
-Often appears fragile or physically vulnerable.

2. A difficult personality

-Initially suspicious, secretive and distrustful of humans.
-Can be stubborn, irritable and dismissive of others.
-Often prioritises his own plans before recognising the needs of his companions.

3. Not always morally exemplary

-In The Daleks (1963–64), he deliberately sabotages the TARDIS to persuade Ian and Barbara to explore the Dalek city.
-His curiosity can override his better judgement.
-He has to learn that his decisions can endanger the people around him.

4. A hero who grows

-Gradually develops a stronger sense of responsibility towards his companions.
-Learns to cooperate rather than simply impose his will.
-In The Aztecs (1964), his determination to avoid changing history clashes with Barbara's desire to end human sacrifice, revealing the complexity of his moral principles.

5. A compassionate heart beneath the exterior

-Develops genuine affection for his companions despite his initial aloofness.
-His farewell to Susan in The Dalek Invasion of Earth (1964) reveals his capacity for love and sacrifice.
-Ultimately becomes a protector who acts out of concern for others, not simply personal curiosity.