Aixon is an NPC that accompanies The Prophet during the Part of Something Momentous, Part II quest. He has an unusually high level of 2000, but all his stats are manually set to the lowest possible values and he never enters a fight.
It is heavily implied that Aixon is the part of The Prophet's mind that links them to the past, since he must be attacked (and presumably killed) in order to escape the Suppressor's imprisonment, which is only possible if one "cuts all ties to their past". However, at the same time, he seems to know facts The Prophet doesn't, such as the High Ones' plans the fact that The Prophet is just an Emissary whose real self died at the bottom of the sea with Sirius. This could be due to the High Ones' "invasion" of The Prophet's mind, which means Aixon is being controlled by the High Ones, or it could be that The Prophet knew about their real identity all along, but simply refused to acknowledge it (which is what Aixon suggests in his dialogs).