Nanex was once known as Sebastian McCain, a researcher at a lab that experimented and studied nano machines. His life was changed one day when an chemical explosion occurred that fused his soul with over 300 million nano machines. From that day foreword, he traveled the world, trying to coexist in this new form. For his voice, he would have a medium voice with a thick Scottish accent and mechanical reverb. Here's his theme to get a better idea of his story and personality: https://youtu.be/ViDerktV2l8