Alright, final rulings:
Out: Cell, Android 17/18.
Reasoning is that they are biological androids, which sort of hampers the feeling of this mechanical contest.
Keeping: Jinzo (Lack of arguments against him)
In:
Sharon 'Athena' Agathon (Battlestar Galactica)
Sentinel (X-Men) The 'Sentinel' character under this name appears in fighting games and the like, so it is a unique character not a group of them
And I need one more entrant.
--
Still smilin'
:>