21O is A Data Analysis Freak | "Family..." - NieR: Automata

This quest is pretty much a mirror of the one between 2B and Operator 6O, so I felt like I should at least show the important part of this quest (and it shows how to get a weapon). 21O was simply doing this for a hobby, and 9S helped her with her hobby, and she rewarded him personally out of pocket for it. She was still a BIT stiff, but for 21O, it was really sweet. She showed a human desire. If not a longing, she at least showed a positive interest in families, even thinking about families among androids.

Also I love Bracers for 9S. Their counterattack is not only brief and therefore leaves 9S the least open to an attack (while he's unable to do an evade, since he can't evade out of his own counterattacks), but it also launches enemies straight into the air so he can then juggle them.

Anyway, yeah, think of any machine that exists in the game, and you bet you can control it!