Rory Williams
Rory and the Doctor are friends but their relationship is troubled by Rory's feelings that Amy may love the Doctor more than him. In "Day of the Moon", he thinks that some of the things he hears Amy say are about the Doctor and not about him. He later learns that the comments were about him. He also gets concerned when he hears Amy tell to the Doctor that she never told Rory that she thought she was pregnant. He forgives this when he learns that she was worried that would be a problem with the baby because of traveling in the TARDIS so much.