She sounds fun! I have a soft spot for flighty characters.
Let's see. Lucas was born and bred in Manhattan with one helluva silver spoon in his mouth. Family is wealthy as fuck, runs with the Manhattan elite. He's also wealthy thanks to a career as a lawyer and a trust fund he unlocked when he turned 25. His father (and his father's father) both successful criminal attorneys. The father retired and went into the political circles of NYC (not all savory). Lucas went to Harvard, Harvard Law. He got burnt out on law and is taking a sabbatical from it and stumbled into being a fixer and thus was hired back as a "consultant" from his former law firm.
He's a fuckboy with a heart of gold. He jokes around a lot. Is not shy about liking the finer things in life while also having a deep respect for those who provide them. A big flirt, sarcastic, bit of a chip on his shoulder, decent chef, likes art and music. Doesn't open up easily, but isn't necessarily standoffish.