She is hard-working, calm and devoted. She is about to put all herself in sake of the Survey Corps goals. Furthermore, she sure, that she needs to keep working hard to achieve more, to be the better version of herself. She is intelligent and always ready to help to the commander. She is trying to fit her lieutenant rank.
She is 20 years old. She has long blond hairs tied into the bun on the nape and deep gray eyes. Her height is 5'9.

Survey Corps lieutenant

Smart, collected, calculating. Willing to take risks to achieve a goal. A little depressed by recent events.

Commander is thinking on tough decision

S.W.A.T lieutenant with deep blue eyes 

Erwin - is heir of yakuza clan. Recently he became a leader of the clan and elders decided he needs to get married. It will be arranged marriage. He wasn't happy about it, but also didn't hesitate about marriage. He knew he needs to do it for the sake of his authority and clan. 
He has never seen his future wife and don't know anything about her. The only thing is known - she is daughter of one of the most powerful yakuza leader. 
Soon enough they will meet...