I think Roman and Neo was homeless childrens they met in early childhood and are now criminal-friends together to "survive"but then as adults they became lovers. And I think Roman hate Faunus due to the fact that Faunus kill Roman parents, that explains why Roman calls all Faunus "Animals". But instead of their destruction, Roman decided to manage them to his advantage, and Neo trying to "cover his back" and helps in achieving this goal. That Roman parents died at Faunus hands, and Neo parents threw out her out of the fact that she was born with a "different color hair" and "different colored eyes", her Semblance was the cause of the destruction of her life. And Roman was the one who comforted Neo.



...But now Roman gone. And Neo s preparing for revenge for "Red".