How do you mean conflicting characters? I do plan on introducing NPC's that bring in conflict and problems.

The plot would start out with us all working a "normal" job (retail or some other job for college age kids). Since all but one of us is an "unsealed demon" we'd be plagued by health issues that are noticed by the "unsealed demon" player. Most likely our characters would be late teens to early 20's and starting to have noticeable problems with our health (basically normal college age kids). We would all be individuals who have a demon soul inside of us.

After getting to know us the demon will try and get us to perform the ceremony to become full-fledged demons. I won't give to much away but below are some stages of the RP

-Beginning (about the start of school or something)

-The demon begins working at the store and recognizes us as fellow demons, and tries to befriend us

-A major incident  happens that forces us to choose whether to die human or accept ourselves as demons

-Ceremony

-Transition (game time several months) and education

-Start integrating into demon society