Rose Tyler- Bad wolf
Martha Jones- The girl who walked the earth
Donna Noble- The most important woman
Amy Pond- The girl who waited
Cara Oswald- The impossible girl
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Everything You Need To Know About The Whoniverse
FanfictionAll the rules and stuff in general that us whovians need to know.
Companions
Rose Tyler- Bad wolf
Martha Jones- The girl who walked the earth
Donna Noble- The most important woman
Amy Pond- The girl who waited
Cara Oswald- The impossible girl