Belldandy’s little sister Skuld from Ah! My Goddess is my favorite of the three sisters. Skuld’s domain is the future, and she’s also a system debugger for Yggdrasil, literally squashing bugs with her mallet. Skuld is also a talented engineer, building things such as Banpei-kun (pictured with her above), who helps out around the Morisato house.
When Skuld finally joins Belldandy and Urd on Earth, she doesn’t like Keiichi one bit, and is jealous that he is stealing precious time with her sister. She eventually warms up to him, though.