Medusa

Medusa is the biological mother of Hatsune Miku and a often mentioned but unseen character in the vocaloid household.

Several centuries before she was attacked by Poseiden in the temple of Athena where afterwards Athena in all her kindess decided to punish Medusa for being attacked in her temple by transforming her into a hideous beast no man could love aswell as her sisters who tried to help her.

Several centuries later Persues and others traveled to her island to take her head to use it's ability to turn any living thing that looks at it to stone in order to save the Princess Andromeda from being sacraficed to the Kraken do to her mother the Queen Ethiopia's blaphemy.

Persues sucessfuly killed Medusa and took her head with him in a bag, as the even though she was dead her gaze was still deadly. the blood from the head when it hit the ground grew into large scorpions. who knows why.

In the end Persues on Pegasus was able to save Andromeda from the Kraken and live happily ever after.

It is unknown when or how she had Miku.