5. Rose, Amy & Sarah Jane
What with Rose and Sarah Jane having met before, poor old Amy would be the odd one out. You can practically hear the bickering already! The squabbling that ensued when Sarah Jane met Rose in School Reunion would be redoubled when Amy is put in the picture. Naturally, her age, leggy appearance, and past professions would all come under fire from the troublesome two. In fact, it would be possible to see Sarah and Rose becoming even closer due to the apparent threat from the newcomer. That said, it's also entirely plausible that Amy would rise to the confrontation and display some of her passionate, headstrong qualities which endeared fans to her in the first place. If she were to assert herself and show that she's not the standard damsel in distress that she could be perceived to be, there's no doubt that Sarah and Rose would welcome her to the fold with open arms.