1. An explosion of colour

-His famously clashing patchwork coat reflects his refusal to conform to conventional ideas of style.
-His flamboyant appearance makes him stand out even among the Doctor's many eccentric incarnations.
-His visual excess mirrors his larger-than-life personality: bold, theatrical and impossible to overlook.

2. A tempestuous personality

-Can be arrogant, impatient, argumentative and quick to express his displeasure.
-Rarely hides his opinions or softens his words to make others comfortable.
-His sharp tongue and unpredictable temper create friction even with those trying to help him.

3. A difficult exterior hiding a moral core

-His abrasive manner can obscure his genuine concern for innocent people.
-Strongly opposes cruelty, exploitation and the abuse of power.
-In Vengeance on Varos (1985), he confronts a society that turns suffering and execution into entertainment, exposing his determination to challenge injustice.

4. An uncompromising individualist

-Refuses to be easily intimidated or told what to think.
-Has an enormous ego and takes pride in his intelligence and abilities.
-His independence can make him difficult to work with, but it also makes him resistant to manipulation and unjust authority.

5. A character who grows beyond first impressions

-His early incarnation is deliberately abrasive, making his development particularly significant.
-Gradually reveals a more protective, thoughtful and self-sacrificing side.
-In The Trial of a Time Lord (1986), he is placed under judgement by the Time Lords, reflecting the tension between his difficult personality and his actions as a defender of others.