larger robot with a more robotic appearance, known as ProtoRobo or Pooh. While this robot looks less sophisticated, it is much more stable and capable of feats of strength and quite delicate manipulations. It also seems to care for its creator's well-being. Mecha Rinrin addresses the brother as , just like her creator. Marie's loyal and highly intelligent Golden Retriever. Despite the name, Michael (named after the archangel) is a female, and eventually gives birth to a litter of puppies. Michael was a gift from her brother, to keep company and guard over her at the times when he could not. The pet also serves to give Marie inner strength, as having Michael depend on her proves she is stronger than others think. Featured only in Sister Princess 2. The local temple nun who the brother visits to addresses many of Chikage's spiritual concerns. Anime-only characters Mamimi, or Mami (眞深) for short, is initially regarded by those new to the anime as the "13th sister." In fact, like the sisters, she has a pet name for Wataru: An-chan (あんちゃん), or "Bud" in the English dub. However, she is just a girl posing as one of Wataru's sisters after he mistakes her as such, and she is sent by someone to watch over him and break him away from the sisters so she can bring him back to Tokyo. Mami can be regarded as a pseudo-antagonist because of her mission, but she mostly acts as comic relief, even learning why the sisters love him very much. Eventually, she becomes a source of advice to Wataru and even goes after him when he returns to Tokyo, hoping to return him to the island. In marked contrast to the sisters themselves, Mami treats him differently, acting as if she is more of a friend than a sibling (though towards the ending of the series, however, there are some hints that Mami might be developing deeper feelings towards Wataru). Furthermore, she doesn't bring a lot of things to Promised Island (only clothes and camping gear) with a hand-held computer and possibly a sewing machine as (arguably) her only luxuries. Although she is not really Wataru's sister, she is somebody's sister. She always receives e-mails from her real brother, demanding whatever happened to Wataru and her plans to bring him back, much to her chagrin. Towards the end of the series, it is confirmed that