Prince Dominic is Rebecca's younger brother and second in line to the throne. He doesn't want the responsibility of the broken kingdom either, and doesn't want to be left alone with his unstable, grieving mother. The siblings have always depended on each other through tough times and it breaks his heart to see Rebecca go. When a search party is organised to find the lost princess, he stalls them for her by sabotaging their supplies. However, he eventually becomes worried and organises a private team to go out and find her to talk. Basically, he's the lead of the B-story. 

[Close friends to Dominic are not currently in this audition but will be added accordingly - I'm just trying to get main characters down ATM]. 

Clothing pictured in the photo provided is him in his 'mage' outfit - all members of the royal family have some sort of magical ability and he can control fire to some extent.