Sunsets and sadness

I'm not feeling to happy.I have a story idea about a princess trapped in her castle by a

big wall. She escapes and struggles to live in a world with humans and demons.

Meanwhile she is hunted by both humans as well as demons who want her powers(that

she does not know how to control yet).Her only friend is a guy that she had known from

since she was small.I have no idea what to name her or the boy. Any ideas?