I am completely canon blind but I skimmed your profile a bit. They seriously have next to nothing in common but Nanami is a newbie in the Watch so that can be something they can talk about. Also, scimitars are badass and they do sort of have that in common as weapons. Places she frequents are currently, morning training, afternoon classes and the financial district is where she patrols from 6-midnight and the expensive stores once she's actually making money. =)