So, since it's been decided that Which Is Why is the theme song for Moonfiend, what about a credits theme? My personal vote is for A Proper Story, since we've got a bit of a Bastion vibe going on already.
Then he began to form an idea in his head. Kill all the Grit. They were the enemy after all. He had the power of magic and technology on his side. With the two of them together the possibilities were infinite.
He glanced over at the roughed up group of people. He had to make sure they lived.
<Snipped quote by Tojin>
Eh I really don't like the idea of a 'luck' as a tangible force. Also the idea that she drains luck from those around her isn't really an asset for the team. It'd be humorous for a bit but it'd ultimately wear thin and/or get forgotten about. Now that said, don't fret right away, with some simple re-writes this power could be essentially left in tact but in an improved state.
As I don't like luck as a tangible force, I'd like to propose 'Probability Manipulation.' Now you're probably thinking, "But Wraith, that's the same thing!" Well actually it isn't! Probability is a set of pre-existing variables that surround every object and situation. When you sit on a chair the probability that it's going to collapse underneath you is very slim but it exists. If Esther was able to manipulate probability she'd be essentially able to subconsciously know and manipulate odds in her favour. She'd know where to strike in order to cause maximum damage, know what object to reach out for in order to hit a target. It'd be like a very strong sense of intuition which to most people would make her appear as lucky.