Team Ninja wanted to include Master Chief in the game as a guest fighter. However, Bungie told them it was impossible for him to be in the game due to storyline restrictions but they were still interested in the idea of putting a non-cannon character from the Halo universe in the game. The end result was the character Nicole-458. In keeping with the idea of English being the language of the United Nations Space Command, Nicole is also the only character in the game that speaks English.
Contributed by gamemaster1991