Megaera the Rancorous
The form of the snakeman is not as some would have it a humanoid snake but rather a modification of the basic serpentine form.  Blessed with three heads, each of which boasts no less than three prehensile tongues, the form is otherwise that of a moderately sized serpent with all the strengths and weaknesses of that form.  Like a snake the snakeman does not wear clothing or carry much in the way of equipment, instead the central head is used to store items internally.

Th snake is question is something like a python, long and thick with a body carrying a diamond type pattern in an off-cream contrasted with a pure black and an electric blue.  The form is about six metres long (although it normally spends itz time coiled up making it relatively much smaller than an equivalent human in size).