Serina

Serina is an Artificial Intelligence (AI) construct that is assigned to the UNSC Spirit of Fire, a modified Phoenix-class Colony Ship. She is set to be one of the main characters in the upcoming Halo Wars, helping the player as they play the game.

Overview
Little is known about Serina at this point in time, other than the fact that she acts as a military advisory AI, which may or may not be her only function. It is unknown if she is a "smart" or "dumb" AI, though she is probably a smart AI due to the fact that she shows characteristics and personality (See quotes beneath) from what we've heard, which is usually a sign of advanced memory capacity, like Cortana, while other AIs known throughout the books and games, only exhibit minor aspects of personality. The leaked image above shows her Avatar as a blue female with short hair. Her clothes look like those worn on a farmland, this is most likely due to the fact that she was assigned to a Colony Ship that was sent to Harvest, an agricultural colony.

Quotes
"What the heck is that?!" (When seeing a Covenant Scarab coming out from a hole)

"Well, this is new... and scary." (upon seeing a Covenant Scarab)

"The MAC is online and primed. Payback time!"