itachi as always proving herself to be best girl
Girls with one fang are great.
Girls with two fangs are even better.
Itachi is all fangs.
What's the difference (also how the fuck did the term used to refer to americans become "delinquent" in japan)
They are mostly interchangable but:
A delinquent is just anyone who's "against society", usually implied to be violent, but may still 'look the part'.
A yankee is more of style and attitude: blonde hair/flashy hair, (historically) flashy embroidered clothes, love of motorcycles or scooters, etc. They are brash and usually aggressive (especially for Japanese) but not necessarily violent.
I am not going to be able to properly convey this, but in Japan there is a huge pressure for society harmony via conformity. I had a great example in another conversation where a Japanese person who was working in the US said he got a huge shock when he said to a coworker "Its cold today" and the coworker said back "Not really". In Japan, even if you don't agree you're supposed to say you agree to not cause any social friction.
Yankees deliberately and consciously flout that to various degrees. A delinquent may give outward efforts of conforming to Japanese social customs.
Yankee was chosen because there was an idealization of American culture (or more accurately, the japanese idea of american cultue) especially the blonde hair.
And the most common Americans encountered were American soldiers. Big, rough, zero fucks given about Japanese social customs.