Originally a Persona, Prometheus grants Kevin the ability to read any and all text across space time from present to pasts plural. Prometheus also holds the personal skill of weapon generation and has his own personality, it bonds well with Kevin, making them a rather Dynamic Duo.
His body constantly gives off strange dust, it vanishes and is in no way tangible.
The scarf around his neck burns forever and reforms, it represents how as new things are born, others must die.
The marking on his chest is a sealed up hole which was then opened to reveal Kevin's open Stand, Canned Heat, who soon became CANNED HEAT REQUIEM.
Prometheus is like Aku in which he can or cannot have legs whenever.