Nero was never exactly a normal person. Being a homunculus created by the God of death wouldn't make anyone a normal person. He spent most of his life raised in the underworld so he didn't really get to experience many earth things. But over the years he got to try things out and explore his new home. Nero is soft spoken for the most part but can be very emotional at times. He was closed off for a long time but came to learn to not be so scared of others. But he still finds most people irritating so he has constant layer of "sass" to his voice for the most part.

He is 19 years old. Characters similar to him are: Nice Di Angelo (Percy Jackson), Nightcrawler (Marvel Comics), and Muichiro Tokito (Demon Slayer)