Auntie Dot
From Halopedia, the Halo wiki
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Auntie Dot was a human Artificial Intelligence construct at the time of the Fall of Reach.[1] Its current status is unknown, but it was likely destroyed in the battle. She will keep the player connected to the rest of Noble team while on separate missions.[2]
Trivia
Auntie Dot's voice will be usable in Halo: Reach's Firefight mode.[1]
Sources