Once I read a Tsukigumi group interview about Asako - with, well, Asako and a bunch of other Tsuki otokoyaku, and among the questions they answered was 'How Sena Jun calls you'.
And apparently she used to call Morie 'Morizo'.
Which kind of intrigued me - I mean, the Morie nickname, as most of the others, most likely comes from the real name, but Morizo doesn't sound like Japanese name to me, so why Morizo?
And now I have a theory. Apparently there was a World Expo in 2005 in Japan, and one of its official mascots was
fluffy green forest monster called Morizo...