since MB-01 was not released, i will not reveal his storyline, but he also has roots on the SFA series.Wasn't he a Nash experiment that ran away and MB-02 was (amongst other stuff) supposed to retrieve him but shit happens ? Or something... I think Ilu mentionned something about him.
If I struggled to the end of my determination, to the end of my way of life with my followers, if the result is ruin, then this ruin is inevitable. Grieve. Shed tears. But you cannot regret.