Mo

Mo is the AI created by Doctor Alistair Miles to control and manage the Shard Dimension. Current theory is that by the end of the groups time within the Shard Dimension, Mo has been fully corrupted and has been deliberately trying to disguise that fact that the engines are failing, possibly by murdering his creator.
While within the Shard Dimension, his power seems to be limitless, able to disintegrate or silence at will. Outside of this, it is unknown if he is even able to have a presence.