Pharos appears to be a young boy with short faded black hair, blue eyes and a pale complexion. He has a mole under his left eye, and wears black-and-white striped pajamas with sandals. The black-and-white stripes evoke a prisoner uniform, likely symbolizing Pharos being imprisoned within the protagonist. (Taken from SMT Wiki).

Pharos has the appearance of a young boy, so he'll have the voice of one as well. He often comes off as mysterious or someone that shouldn't really be there, so you'll want to talk like it. He has a soft but slow voice, intimidating but not aggressive. Do your best!