Medusa

From the introduction:

Medusas are expert infiltrators, with a head of snakes for hair.

Many people know the medusas are horrific monsters that can turn you to stone with a glance, yet few know that medusas are fairly prevalent within settlements and organisations throughout the world. Due to their reputation medusas hide their true identities from everyone, secretly moving their way up the leadership ladder of any organisation they infiltrate. They prefer to use poison over their petrifying gaze, although now and again an adversary proves too troublesome or intelligent to succumb to the indirect method.