Backgrounds

https://cloudnovel.net/browse/free/background/popular
https://www.pinterest.com/jasgurl91/visual-novel-background/
http://beizen.pancakeapps.com/
http://hellohello.dousetsu.com/free_material.html
http://blog.goo.ne.jp/ari1192jp_001/e/300120919a4c90232577f5777173262f
http://k-after.at.webry.info/
http://www5d.biglobe.ne.jp/~gakai/
http://www7b.biglobe.ne.jp/~osumashi/free_bg.html
http://visual-novelty.deviantart.com/gallery/52140928/Backgrounds
http://loo.sakura.ne.jp/sozai_m.html
http://www.thoe.net/e/
http://www.polaraul.com/vn.php
http://ayaemo.skr.jp/materials.html#material_background
http://doga.jp/~kama/L3BackPic/
http://material.animehack.jp/bg.html
http://masato.ciao.jp/haikei/furemu.html
http://mao.sub.jp/bgd_out.htm
http://pochi.eek.jp/m_kisekae.html
http://breakfastdoodles.deviantart.com/
http://belldew.tumblr.com/tagged/free%20to%20use

Characters

https://cloudnovel.net/browse/free/character/popular
http://www.jewel-s.jp/download/
http://khmix.sakura.ne.jp/download.shtml
http://visual-novelty.deviantart.com/gallery/52141191/Characters
http://opengameart.org/
http://tokudaya.net/index.html
http://sozai.hanabie.com/top.htm
http://camellia0313.blog.fc2.com/?all
http://sgst.x.fc2.com/sozai/sozai_base.htm
(Monster Sprites) http://cyanyurikago.web.fc2.com/material.html
(Ripped, Re-Usable Sprites) http://www.spriters-resource.com/
(Free Sprites) http://lemmasoft.renai.us/forums/viewtopic.php?f=52&t=28377
https://lemmasoft.renai.us/forums/viewtopic.php?t=21515

Music

https://cloudnovel.net/browse/free/music/popular
https://soundcloud.com/dj-rolfsky/sets/tyranobuilder
http://murasato.catfood.jp/bgm.php
http://dig.ccmixter.org/free
http://visual-novelty.deviantart.com/gallery/52988912/Music
http://incompetech.com/music/
http://musmus.main.jp/english.html
http://cyber-rainforce.net/english.html
http://actin.jp/smp_mp3/
http://asobeat.com/
http://www.sougetsu-on.net/
http://maoudamashii.jokersounds.com/
http://pocket-se.info/
http://pianosdauge.org/
http://soundimage.org/
http://skittykitty216.wixsite.com/website/music