Master Chief

Indeed, Master Chief is a loyal mature, cold man, around the age of 35 years old. He is the captain of Silver Team and also a Spartan. His real name is John, he was brought and kidnapped by Catherine Halsy at a young age when he was a kid, to be trained to be a deadly weapon. He is friends with his team and also loves a young woman names Makkee. He works with a built in ai named Cortana.