|Age:||Thousands of years old|
|Fairy Tale:||A Midsummer Night's Dream|
|Appearances:||"Once Upon a Crime"|
Mustardseed is described as looking like Puck, except cleaner. Sabrina was surprised that Mustardseed was brothers with Puck, because the latter was grimy. He is also described at being more mature than Puck, although he is the younger of the two. He has blond hair, porcelain-like skin, and appears to be no older than eleven years.