Peppermint

Previously known as 'Subject One', Peppermint was a genetic experiment created by Commander Tartar, specifically to test the genetic blend's potential for learning and level of intelligence. As such, while in its test centre, she was taught various subjects - maths, core sciences, languages, physical geography, engineering, (human) history etc. She is well educated and knows how to apply her knowledge, however she grew up in complete isolation so her social understanding is extremely limited. The test centre was directly beneath the Deepsea Metro, when Agent 8 defeated Tartar and destroyed the NILS statue the whole centre deactivated and she was able to leave and see the world at large. She chose her name a couple weeks after leaving. 

go read piperidine on ao3 to see her whole story