I don't know where you got that from but this is a deity, not a Miko. A Miko is a human girl who is often the child or relative of the priest who is taking care of the shrine. A Miko's job is to help taking care of the shrine and doing chores.
BTW, there are male fox deities. Divine Guardian is just another way to call the kami whose job is to protect their territory and the people in it. And kami can be either male or female. The first kami, Amenominakanushi, is genderless, though.
Also, the clothing and hairtyle of this fox deity are what noble boys wore during Heian period. Girls don't wear this type of kimono. His clothing is completely different from the Fox Goddess in Nobu. You can check out Haku, a river deity, from Spirited Away. His hair and clothing are really similar to this fox deity.