I was given a chicken

Hi, my folks have always loved chickens and recently they stumbled upon a group of mixed chicks for free on marketplace.

A two were very sick and one didn’t make it but I managed to nurse one back to health. Little guy follows me everywhere and is very friendly despite what I thought I knew about roosters.

My only problem is that I don’t know what kind he is or if he’s mixed. Help would be greatly appreciated!