Who is Nicholas Walker from Stories: All-New Tales and what is their importance?

Nicholas Walker is an alien being who has been on earth since 429CE. He has been monitoring Earth for fifteen hundred and eighty-one of his eighteen hundred and seven years of age. He is grateful that he has been found and is ready to have the world know he exists. Based on his people's lack of contact, he is convinced that something catastrophic befell his home planet. He has recorded (and is willing to give Earth) 73,496 hours of video of round the world chronicles for the duration of his time on Earth.