1. A man of action

-Practises Venusian Aikido, allowing him to defend himself and others physically.
-Is more willing than his predecessors to engage directly with dangerous opponents.
-Combines intelligence with physical courage rather than relying on cleverness alone.

2. A taste for gadgets and machinery

-Uses his scientific expertise to build, repair and adapt technological devices.
-Drives Bessie, his distinctive yellow vintage roadster, and later uses the Whomobile.
-Often solves problems with practical ingenuity, making him resemble a classic action-adventure protagonist.

3. A frontline defender

-Frequently works alongside UNIT, a military organisation tasked with defending Earth against extraterrestrial threats.
-Cooperates with soldiers and scientists to confront invasions, monsters and technological disasters.
-Is willing to enter dangerous situations himself instead of directing events entirely from a distance.

4. A fearless opponent of evil

-Confronts powerful enemies with confidence and determination.
-Uses a combination of physical skill, scientific knowledge and quick thinking.
-In The Green Death (1973), he investigates a deadly environmental disaster and confronts the powerful Global Chemicals corporation, demonstrating his willingness to challenge dangerous institutions as well as monsters.

5. A gentleman with a rebellious streak

-Maintains impeccable manners, refined clothing and a strong sense of personal style.
-Has a short temper and is not afraid to challenge authority, including UNIT's Brigadier.
-Combines the sophistication of a gentleman with the daring attitude of an adventurer.