The Noto serif font for CJK languages (default Japanese)
The Noto serif fonts have superseded the Droid fonts, which were originally designed for the use in Google's Android. Noto's aim is to be a free for everyone, with beautiful glyphs for all languages, looking good especially when multiple styles and weights and even languages are mixed on a page.
This package supports Japanese, Korean and simple/traditional Chinese.
Included are various weights and two 'monospaced' typefaces ('regular' and 'bold').