Marley Russell is a very vengeful soul, having lost everything good in life and is now living solely off of his hatred for a particular individual (and his mysterious augmentations). This particular individual has not only mistreated him after taking him in from the streets, but she has also gotten two of his only friends essentially killed (in the context of the original game, they are both forcefully infected by a potion and turned into this game's equivalent of zombies). On top of this, there's a voice in his head that refuses to shut up, someone Marley calls "the doll person". This voice pressures him into making decisions, most of which he agrees with, but doesn't understand why he wants it done, and finds him rather annoying. Nevertheless, Marley will stop at nothing to ensure that anyone who deserves it suffers and dies.

Marley has an official voice, done by his own creator. When auditioning, try to mimic this the best you can. But also convey the feeling of a very angry individual with nothing to lose.

https://youtu.be/KpUn7djgn14?si=MDGWue0akzHlTThK