Group Hug

Rogue and Ninja seem too close alike. I say one or the other.

Anyway, I suggest a summoner-type class. It can be a good guy who summons demons. Reference is Malconvokers from DnD. 2nd possible member is a support like a Bard. She'd play music to strengthen teammates, but can also fight with her lute and uses sonic blasts as attacks.

The difference between Rogue and Ninja is that the Rogue is melee, while the Ninja will be more range orientated. Also some skills.

I'm liking the Bard/Composer idea, it might be possible. We're also leaning toward a Gunner rather than a Summoner, but a Gunner wouldn't fit with the setting of our game.