This one I'm 99% willing to say is an original character. Went through every image in Danbooru that has both the "dakimakura (medium)" and "headband" tags on it and nothing comes close to this design. That typically means it's not an established character.
Kokoro Eguchi from "Tonari atsu ga Souiu Me de Mitekuru". Source for this seems to be hard to come by because it's apparently art made for a physical product and a digital version isn't anywhere to be found. ...Other than the one you have yourself, that is.
That's Miyuki Hoyama at the center and the guy to the left is Makoto. This is a promotional image for "Ijime to Kaeru to Mama to Fukushuu" ("Bullying, Frogs, Mom, and Revenge"), using panels from the manga itself. Just checked it out and these doujins you're making me find out about are no joke. XD
https://myanimelist.net/manga/194227/Ijime_to_Kaeru_to_Mama_to_Fukushuu
Yuna from "Dia Furo" (original title "ディア風呂").
And that's from the first chapter of the manga: https://yanmaga.jp/comics/%E3%83%87%E3%82%A3%E3%82%A2%E9%A2%A8%E5%91%82
You can actually read it yourself off that link if you click on the chapters at the right, just remember to scroll to the left. It's actually as spicy as it appears to be. Surprises me, for good that is.
That's Saori Kirigiri, from "Shounen, Chotto Sabotteko?" ("Hey boy! Let's take a break.")
https://myanimelist.net/character/194488/Saori_Kirigiri
https://myanimelist.net/manga/119363/Shounen_Chotto_Sabotteko
The scanlation group in charge of translating this made a Facebook post with a high res version of the image: https://www.facebook.com/photo/?fbid=848771155608796&set=pb.100067439408006.-2207520000
That's Don Quixote, from Limbus Company.
That image is an edited version of this original, which is official game art: https://limbuscompany.wiki.gg/wiki/Don_Quixote#/media/File:DonQuixoteArt.png
From left to right. Character links are ACDB, anime/manga links are MAL.
[url=https://www.animecharactersdatabase.com/characters.php?id=54489]Nonohara Yuzuko[/url] from [url=https://myanimelist.net/anime/15911]Yuyushiki[/url]
[url=https://www.animecharactersdatabase.com/characters.php?id=23287]Merry Nightmare[/url] from [url=https://myanimelist.net/anime/9331]Yumekui Merry[/url]
[url=https://www.animecharactersdatabase.com/characters.php?id=122393]Chitose Nakai[/url] from [url=https://myanimelist.net/anime/36726]Yuragi-sou no Yuuna-san[/url]
[url=https://www.animecharactersdatabase.com/characters.php?id=23841]Tooru Ichi[/url] from [url=https://myanimelist.net/anime/9776]A-Channel[/url]
[url=https://www.animecharactersdatabase.com/characters.php?id=43905]Tsumiki Miniwa[/url] from [url=https://myanimelist.net/anime/12291]Acchi Kocchi[/url]
[url=https://www.animecharactersdatabase.com/characters.php?id=78557]Tamaki Honda[/url] from [url=https://myanimelist.net/anime/32555]Stella no Mahou[/url]
[url=https://www.animecharactersdatabase.com/characters.php?id=90161]Kaoruko Moeta[/url] from [url=https://myanimelist.net/anime/35756]MAL[/url]
As someone who just wants to help people find characters, I'd like to ask you to make separate posts as it suggests in the guide.
"Please do not request multiple, different characters/images/links in the same post - make a different post for each different request."
You don't have to crop them or anything (prob shouldn't, even; makes it harder to look up), but having a shorter request will probably help actually get answers ≺3