media-fonts/noto-20170403 installed /usr/share/fonts/noto/NotoMono-Regular.ttf media-fonts/noto-20180905 does not install that font. This results in applications that use that front breaking, such as Kodi, see bug 669204
It is done on purpose by upstream, and I see other distributions being also ok with this: https://github.com/googlei18n/noto-fonts/commit/d2bb40b103a3ced0b397cb8acb91c6f84fe05921 https://github.com/googlei18n/noto-fonts/pull/1029 In summary... you need to move to NotoSans-Mono...