Doomsday Weapon's armor was built to be anti-starship in class. Doomsday Weapon went renegade, destroyed ships of his own kind and escaped. Now he's a random force of destruction and has attacked starships from many fleets of various worlds for little or no reason.
His arm cannon can obliterate most ships and cripple others in one shot. Weapon seems to be locked in his programming of destruction and attempts to reprogram have failed. Attempts to destroy have also failed. General Zarose managed to access his programs and make him untrackable as well.
Weapon's Galaxy Zento Stats are: STR: 10 END: 10 SPE: 7 AGL: 2 MNT: 6 (appears to have damaged mentality)