Seraphiel ended up being Solace. It was also a positive name like Aurora's, but it fit her very well, so I didn't argue with our gorgeous elf when she proposed this alias for herself. It fit her serene and peaceful personality, and as the healer of the group she would be our solace. Our two supporters had positive names, while the rest of us who would take our enemies' souls had negative ones. It was fitting in the end.
As for how receptive Seraphiel was to becoming a criminal, I don't think she has much against living unlawfully in general since she got shafted by her own government when they conscripted and sent her on an invasion which basically ruined her life.
Legality is severely overrated on this continent, I must say. All the privileged people are blatantly abusing their power, while the powerless ones just have to do deal with it or turn to the 'dark side', carving a path out for themselves using any means available.