Skuld is a character from the Oh My Goddess manga and anime.
She is a Heaven-born angel (called "goddess", althought she is not actualy a goddess) and the sister of Belldandy and Urd.
When Yggdrassil (the computer in Heaven that controls the universe) starts glitching, Urd comes down to Earth, to Nekomi City in Japan, blaming Keiichi for what happened. Once Belldandy talks sense into Skuld, Skuld manages to create a device that fixes the glitch. She then decides to remain on Earth, living with Keiichi, Belldandy and Urd.
At the end of the story, Skuld decides to move to her own place and make a living patenting and selling her
inventions.
Skuld is a brilliant scientist, creating impressive technological marvels. However, she is also rash and impulsive. She enjoys being alone, and she reacts violently whenever Keiichi acts affectionate towards Belldandy.
However, Skuld genuinely likes Keiichi, and does help him as much as she can.
Skuld has a rivalry of sorts with Urd, that is eventually settled at the end of the story.