Seems legit. you could have her just jump up into the rafters again, or smoke for 12 hours straight and living to see another day or have Angels attack, or Angels and Demons attack or have the Holy Knights attack.
Powers: if an enemy is weakened enough he can steal their soul and life force by being near them or touching them with ether his hands or weapons thus absorbing their life force and soul, he can also fire a torrent of grey smoke like fog that weakens his enemy's by draining their life force at a fast rate and when they become weak enough it will steal their soul as well, he can become intangible at will, when he passes through objects like walls he seems to turn into smoke and reforms on the other side, this goes for when something goes through him as well, he can also fly and has immense strength, he's known to be immortal (can't age) and can regenerate
Appearance:
Skills/abilities: he's great at fighting with his bladed weapons, and he's good at the art of stealth, when someone stands near him they say the air becomes frigid, a grey fog like smoke obscures his feet whether he's standing still or walking, he seems to glide over the ground when he moves
Race: Fallen Angel
Personality: Death isn't the most talkative being, he takes everything seriously and doesn't joke around when it comes to getting something done, he's slow to anger and he's wise
Equipment: what you see in his Appearance, his blades and armor is made out of unknown metals that are stronger and harder then reinforced steel