Monika should seem distinct in her voice. I'm not looking for anything specific, just something that makes her feel a bit different to the others. You can do this through giving her a unique inflection, giving her a particular accent, whatever you think might work, as long as you can do so and still sound natural.

I feel like the third audition line requires a note that would kind of crowd up the space, so I put it here: This line is kind of hard to gauge without knowing what is happening in the scene. It's one of the reasons I mention that you should have at least seen the game once, if not played it, to audition. If you aren't aware of what's going on in line 3, feel free not to use it. The context of the scene is really required to know what to do with it.