A two-octave range from G3 to G5 is NOT a baritone. In fact, that's not even close. In choral music, G3 to G5 fits the EXACT definition of an alto range.
Are you just throwing scraggy out there and hoping something will stick? Seriously, lol, you've never heard his voice but you're suggesting he needs a darker timbre. What if he is swallowing his vowels and needs a wider, brighter timbre?