Margo

Margo is an administrator at The Guild, she frequents the library and helps out in the clinic a lot. She is part of Percy's "redemption" arc. As she has read all about him, she knows his personality quirks/his behaviour, plus as having her fair share of shitty boyfriends; this makes her more savvy to his charm and actively avoids him. 

Percy begins to realise her efforts and views her as a "challenge" and tries his best to get in her pants. She starts with saying she is already with her (non existant) husband to deter him... which fails as commitments have never stopped him before and he finds pride in banging wives and husbands, bonus points if they leave their spouses. Percy begins to learn what she prefers in a relationship and starts "getting to know her" as well as take her on dates. Margo cant help her feelings for Percy, despite knowing they're wrong and that his are not real. Unbeknownst to her, he began to fall in love with her too and has started to neglect his other partners and fling lifestyle in order to spend time with her. In the end she thinks why the hecc not, gives in to what he wants, she'll have a good time even if it ends in a heart break she knows is coming, so that's okay, right? They do the do, and Percy tells her honestly to leave her spouse to which she reveals it was a lie. Surprisingly Percy is over the moon and wants to try a more "serious" relationship with her which Margo is very unsure about. referring to Percy's known behaviour but he promises he will be faithful. 

She is also concerned with Mutie, who frequently tries to seduce Percy but fails miserably. Margo wasn't expecting to have a fulfilling relationship with a God known for unfaithfulness and tricks, and still at times suspects there is an ulterior motive, but Percy reassures her and is a model partner.

She also begins to build a relationship with Mutie, they end up moving in together and enjoy each others company.