What are the motifs in Next to Normal by Brian Yorkey?

Loyalty is a recurring idea. Many of the main characters (the notable exception is Natalie) exhibit profound loyalty or steadfastness to the other characters - or, at least, they proclaim it to the other characters. Whether they actually act upon it is another question. For Dan and Henry, their belief that they have been loyal to the troubled women they care about (Diana and Natalie respectively) is an arguing point they frequently deploy as they try to convince the women to trust them.