Moth Queen (モスクイン) is a wild Mechaniloid enemy in Mega Man ZX that makes its home in frozen areas. It is mostly harmless and people often gather them to put on display. They appear in Area F. It drops ice particles that slows the Model ZX Mega Man in most of their forms (FX being the only one immune to this effect).
In Mega Man ZX Advent, one Moth Queen appears in Arctic Ice Floe 2. Mary gives a request to the player to recapture it for her, as it is flying too high for her to reach. She heard it was popular with celebrities because they're beautiful, so she will sell it to earn money. Despite not being an enemy this time, it still drops ice particles to slow the Model A Mega Man down, except when they are in a Fire elemental form. It can be obtained early with Buckfire's Rockit or obtained later with Queenbee's flying capabilities.