Skuld created and built a humanoid robot named banpei-kun, whose primary function was originally to guard the temple in marller. however, this has since expanded to include protecting against any threats sent by demons, as well as safeguarding belldandy from keiichi morisato. over time, skuld added new abilities and functionalities to banpei-kun, allowing him to travel anywhere for extended periods without needing a direct power connection via an external cable. when the battery runs low, banpei shuts down and enters memory preservation mode.
banpei's program has evolved on its own, leading to his gaining sentience, an appreciation for life, and even the ability to love. despite sigel not being interested in him, banpei continues to try to get her to appreciate him and is willing to risk serious damage to himself if necessary. his emotional circuit works at varying degrees, ranging from being completely shut off to almost alive. in recent times, it has gained stability, ensuring that he remains alive at all times. when unable to express emotion, banpei uses a permanent marker to draw what he's feeling on his face.