Sigel
Sigel was actually a robot found outside another shop. Banpei is madly in love with Sigel and thus Skuld decided to give Sigel "life" and the ability to move and think for herself.
But it seems that her character to quite stubborn (from my point of view) as she slowly begins to like Banpei but does not show it. Sigel is also appointed as protector of Keiichi's house too. Sigel too can repair herself without the help from others except running out of batteries, which will render her helpless. Overall, I think that Sigel will be the best robot that anyone can create.
