Ah I see what you mean. When you asked about devil birth I thought you meant a species of devil, not all of them as a whole. But in truth, something like their creation and powers depend on the species as there’s different breeds of “demon”.

For example, since this is in the Japanese branch and most “demons” would be Youkai in this area, they’d indeed be more spiritual. More traditional devils in the more western branches would be more flesh and blood creatures susceptible to physical firepower.

I don’t really have a preference to what people play, be it Youkai or a western devil. As a Youkai you’d be more ghostly as per the region while as another type of devil you’d be more physical.