Thought I'd document this here.
Some weeks ago I decided I'd find the smallest font packages I could find but that would still cover the biggest amount of Unicode.
After consulting with Reddit I came up with the following list:
ttf-dejavubecause some programs just need it and it's a pretty global "default" font in open source.
ttf-liberationan extremely good looking alternative to some MS fonts. Excellent for default
adobe-source-han-sans-otc-fontsfor full CJK support.
ttf-noto-nockjfor big coverage of Unicode that isn't CJK.
Just thought I should share that, considering some other people may be looking for the same thing some time in the future. :)