Noble Scarlet is Skuld's angel. Every goddess has an angel that must obey the goddesses so that each goddess may gain more power when needed. Belldandy has Holy Bell, Urd has World of Elegance, and finally Skuld has Noble Scarlet. The thing that is different between the relationship between Noble Scarlet and Skuld from the other goddesses and their angels is that Skuld has no control over Noble Scarlet.
Skuld hatched Noble Scarlet from her egg too soon. And so Skuld has the least control over her becuase she doesn't have enough power at the time. Noble Scarlet has freedom to whatever she wants to and therefore causes mischief to Skuld. Noble Scarlet has the power of water.