There is another post for you to describe your personal Spartan character. But what about your other Halo characters. Not just human, but the other races in the Universe galaxy. For example:
Race: Sangheili
Name: Joram A’lleum
Age: 57 Human Years
Rank: Ultra
Clan: Nor’ilema Warrior Clan
Location/Warship: Stationed on the Crusader-class Brigantine Heavy Carrier Warrior’s Courage
They can be any race you like; Brute, Hunter, Elite. Whatever you prefer. And you can make multiple characters of the same/different races. Go all out!