Henry Emily should have a firm, slightly eccentric voice, with a tone that reflects his genius and obsession with his creations. He is a creator and inventor, so the tone must blend enthusiasm with intense seriousness. Think of something along the lines of a brilliant, obsessed scientist like Doc Brown (Christopher Lloyd), but with a darker, more melancholic edge. The delivery should be thoughtful and full of nuance, with moments of emotional outbursts showing his passion and frustration.