Miro is Mino's father.
Miro works for the king he knew Arthur's Grandpa Archibald. He lost his son 3 months before Arthur came. He knows a lot of useful things. He was very happy to see Arthur when he came. He saved Arthur when the mosquitos came to the land of the Minimoys. The movie does not really say or show much about and of him.
By the way BraveChronoKnight did the Biography and the top. I did not do the info box.