Danbo (also known as Cardbo) comes from a chapter of the popular manga "Yotsubato". I have seen many different versions of the character for quite some time now. It seems to be a popular subject of photography.
I think its spread has mostly to due with the fact that it has been recomissioned by Amazon Japan and has become a mascot of sorts for the site.
However, I have one problem when it comes to deciding if this is memetic or not. Is it popular because of spread (I have met several people who love Danbo while not knowing its origin)? Or is it popular because of the original manga and therefore classified as fanart?