Real purpose.

"A… person…" Zero Three said. "I'm a person now?" 

"Yes." Sam replied.

He had thought long and hard about whether he should tell her or not, however in the end he decided to do it. 

The reality is, Zero Three had been showing signs of sentience for a while now. He had attributed them to her slightly aggressive personality, but it turns out he was right the first time.

"You say that but…" tilting her head, the young Valkyrie spoke with a confused expression. "I dont feel any different…"

"Well, it might take time for you to notice." Sam said. "With that said, I need you to understand what position you are in."

"... I'm in trouble, aren't I?" 

The young Valkyrie seemed to shrink a little, her anxiety becoming more visible.