Skuld is a character from the Ah! My Goddess anime and manga. Like her sisters, she's a 10-dimensional entity that is able to manifest and survive in our 4-dimensional universe thanks to her emblem control program (that is located on her forehead).
If she uses too much energy (or if the functioning of her emblem control program is disrupted), she can use ice-cream (preferably the brand 131) as an alternative energy source.
More information about her can be found in the Wikipedia: https://en.wikipedia.org/wiki/Skuld_(Oh_My_Goddess!).