10. Sarah Jane
One of the only characters to transcend both the old and new shows, Sarah Jane debuted with the fourth Doctor and remained a strong character, often playing the part of the damsel in distress, but steadily becoming a stronger character in her own right. She even went on to star in her own show, The Sarah Jane Adventures, which was targeted at a slightly younger audience than Doctor Who was. She’s a must for this list, especially with her genuine good, caring heart, and lively spirit.