From the Witch's Heart wiki:

Noel is a gentle, respectful man. When he's together with others, he smiles quite freely and can easily make good conversation. He shows lots of kindness to those around him.

However, he is somewhat mysterious. He tends not to say everything on his mind, save for when he's with Claire. He seems to be so comfortable around her that he shows exactly what he's feeling. He makes no effort to hide anything he's thinking.

NOTE: As a child, Noel is referred to as "Patricia" and dresses in feminine clothing. He presents himself entirely as male in the present. It is believed that he may be FTM trans, however, it is open for player interpretation.  

Voice: I imagine he speaks softly and takes care in what he says. A medium-high masculine range is desired for him, and take note that he is on the younger side, but still mature (23 years old).