Donna Noble was a female character who:
-was in her early forties but didn’t have her life all together yet
-didn’t have a perfect Hollywood figure but nobody made a joke about her weight (to my knowledge)
-super funny and empathetic
-doubted her capabilities at first but learned to trust herself
-wanted to go on crazy space adventures but simultaneously wanted to get married and have a family and she was never derided for wanting both
-had a rich platonic relationship with the Doctor
-Appreciate Donna Noble
I’ve said this about a million times, but Donna is truly the best companion
