Greene is the second oldest member of the Spectrum Siblings. He is extremely jealous of Indigo's highest status, and is willing to do just about anything to get what Indigo has. He is aware that Rose wants to get close to Indigo and he would help Rosie, in reality is trying to find a way to exploit this against Indigo. Although he cooperates with Grisaille, he still despises him.
He is also known for being a bounty hunter against some exiles, in particular vamps.