[Honoakari]

Short answer: nope.

Spoiler for story details:

She is a fairy from Hell sent by Hecatia to help Junko with her plans. Her role is to fill the lunar surface with Hell fairies (who are then 'awakened' by Junko's powers), and thus bring heavy impurity to the Moon.

As for her clothes, it's speculated that she wears the USA flag design to annoy the Lunarians even further (since it reminds them of the NASA expeditions).