UmePlus fonts are modified Ume and M+ fonts for Japanese.
Note: M+ fonts includes some "tall" characters, so we need bigger line pitch.
UmePlus CL fonts are modified Ume CL and M+ fonts for Japanese.
MMCedar are combined fonts that use Motoya L Cedar and M+ fonts. Motoya L Cedar lacks some characters, so I generated the fonts.
Meguri fonts are modified IPA and M+ fonts for Japanese.
Komatuna fonts are modified Konatu and M+ fonts for Japanese.
Most Japanese websites were designed for "MS P Gothic" font. "Monapo" font is a combined font that uses ipagp.ttf and mona.ttf. It has almost same width as MS P Gothic, so it can show Japanese Ascii Art properly.
A comparison of MS P Gothic (top) and Monapo (bottom):
IPA P Gothic (top) and Noto Sans CJK JP (bottom):