I don't use Debian with graphics, but I can help with the font problem!!

I host a copy of the "lost" font Giko2 on the server Boards runs on (https://boards.graybox.lol/giko2.ttf). Just install that font under the names "ＭＳ ゴシック" and "MS Gothic" and you're done! Giko2 is basically a 1:1 recreation of MS Gothic, including the pixelation.