Sigel

From OMGWiki

Sigel was originally a "welcome robot" that Banpei fell in love with, and later on Skuld animates her and even gives her emotion circuits. However, Skuld didn't program her to even like Banpei, so Banpei had his work cut out for him!

Sigel's an interesting character, to say the least. It's obvious that she's beginning to have feelings for Banpei, but their relationship moves even slower than Keiichi and Belldandy's relationship... then again, Sigel is very pigheaded in a sense and very adamant about not being too comfortable around Banpei.