Leela

One of the Fourth Doctor's companions.  She was a member of the Sevateem tribe who refused to believe Xoanon was a god.  She helped the Fourth Doctor fight the Tesh and cure Xoanon.  She then accompanied him in the TARDIS.  She helped him fight the Robots of Death; Magnus Greel; a Rutan on the island of Fang Rock; the Nucleus of the Virus of the Purpose (when she first met K9 mark I) and to which she was naturally immune; the Fendahl; the Usurians; the Oracle; and finally the Vardans and Sontarans on Gallifrey.  There, she fell in love with Commander Andred of the Chancellory Guard.  She and K9 mark I elected to remain on Gallifrey.  She had a savage but trusting nature, and her favorite weapon was the poisonous Janus thorn.