Ofcourse you can hell I think the majority will be Demon. But By Demon I only mean to describe their look. They all are Descended and you can have them look almost anyway you want but as long as it follows the general appearance of their ethnic group (Tyro, Nayu, Lassa, Sol, Oro, Seraph & loosely Dragon) though you can mix the ethnic lines for more original appearances. The typical Descended look are like this.

Descended- Demon appearance 
Female - http://www.deviantart.com/art/Dragon-Caller-84472057
Male - http://www.deviantart.com/art/Half-Dragon-370022921

Descended - Dragonkin appearance 
Male - http://www.deviantart.com/art/Lizard-man-288986161
Female - 
http://www.deviantart.com/art/Calliope-454046513

All having a mixture of Seraphim and Dragon in them. Some more oc pne than others. The majority however look like Demons. This is what makes a Descended