Mozc is installed (openSUSE 16.0, KDE/Plasma, Wayland), the ibus icon on the task bar is present and allows me to select “Japanese - Mozc” and the little Mozc window appears. But selecting Hirgana or Katakana has no effect – that is, typing Romaji doesn’t produce the kana characters, instead the latin characters appear as typed.
As an aside, there seems to be a build/packaging defect in that installing Mozc doesn’t automatically pull in ibus-mozc even though the README.txt in the Mozc package requires executing a program in the ibus-mozc package (not in Mozc package), so installation took a bit longer than expected while that program was hunted down.
Mozc worked in release 15.6 with X11 on this machine. I have seen some very old posts that say Mozc has problems working with Wayland, but I had hoped that that was no longer the case.
If anyone has got Mozc working in this environment (16.0 etc) and has resolved this issue please could they let me know how.
I don’t know the right way to fix this but I resolved the problem by logging out, rebooting, and logging back in again.
There are still miracles around 
Having to do something as disruptive as I ended up doing is all too reminiscent of a certain hardware and software vendor’s standard help desk response to every problem: switch it off then switch it back on again. Although in my case it did not involve a blue screen.
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