I think they are trying hard to localize their emoji to crack into the States, based on this blog post: http://www.oneskyapp.com/blog/secret-monetizing-messaging-ap...

I'm curious, do they advertise in the US? In Asia (HK/Singapore at least), LINE have TV commercials and various promotional efforts with bricks and motor stores (e.g. soft toy versions of their stickers after $x of purchases at 7-Eleven).