I'ma just post this for a Minor Character. He'll make an appearance somewhere.
Real Name: Up to debate.
Known name: The Purple Mist
Sex: Male/female (it's practically unknown)
Age: Unknown
Race: Unknown
Power: Purple Mist
Power Detail: Surrounds himself/herself with purple mist, and when the mist clears he/she is practically invisible. He/she can be detected with the Detect life spell. He/she still emits sound and if you listen carefully you could heard him/her, but as a trained assassin he/she is practically silent. The invisibility doesn't wear off until he/she wants it to. Anything thrown on him/her while invisible will remain visible. That includes dyes, blood, anything that can stain. He/she can also Flood the whole room with the purple mist.
Alliance: Shadow lord
Affiliation: Shadow lord's personal assassin.
Armour: Custom purple/black Dark Brotherhood, He/she possibly dyed and created it himself. He/she wears a mask and hood to remain unknown.
Looks: Unknown
Weapons: Two long ebony Curved Ebony blades.
Dialogue Colour: Cyan
Bio: Unknown, Everything of his History is unknown. To where he/she has come from to where he has been. It seems only the Shadow Lord knows who he/she is. He/she is practically erased. He/she doesn't even speak.