Mangas with transgender authors and/or illustrators. Not all the mangas have transgender themes in them.
Part 2: https://myanimelist.net/stacks/54374
Not on MAL (yet):
Ayana Tsubaki (trans woman) (author)
Watashi, Danshikou Shusshin Desu. Comic
Yoriko Kamikawa (trans woman) (author)
Sayonara Chinchin Welcome Manman ~OL ni naritakute Seibetsu Tekigou Shujutsu shita~
Keito Gaku (trans man) (author and illustrator)
Akarui
Chii (trans woman) (author and illustrator)
Majo ni Naritai Otoko no Ko
Manga de Wakaru: Taino SRS (Seitenkan・Seibetsu Tekigou Shujutsu)
Mofu☆Mofu: Ichigo Aji (that one's on MAL- I just can't add it for some reason)
Trans shojo-chan (trans woman) (author and illustrator)
Mirai kara kita Jibun ni Onna ni naru you Settaku Sarersu Hanashi
Danshi Jidai no mtf no Manga/Koukousei Hen
Asuka Miyazaki (x-gender) (author and illustrator)
Kyouhaku sei Shougai desu!
Kyouhaku sei Shougai Chiryou Nikki
Shou Arai (intersex man) (author and illustrator)
"Seibetsu ga, Nai!" Hito-tachi no Hoken Taiiku
Anokoro Ore wa Joshikousei
Asia wo Futari de Aruite Mita - Chuusei Oji-san to Otokonoko no Ryokouki
Chuusei Furo e Youkoso!
Ore no Mawari no "Seibetsu ga, Nai!" Hitotachi - Arai Shou no Sekumai Kouyuuroku
Saikin sa Otona to Wakamono ga sa... Suggoi Chigaku ne!?
Seibetsu ga, Nai!
Seibetsu R!
Seibetsu x Renai Hakusho
Kazuki (x-gender) (author)
Onna no Karada ga Iya nano de Mune wo Torimashita
Poppy Pesuyama/Stunning Sawamura (x-gender) (author and illustrator)
Sasada wa Tomodachi
Sumire Nekobungi (trans woman) (author and illustrator)
Azami on the Tail
Sashimi Forest
Doppel Debussy
Alice Sherlock: The Rubious Nebula
Basilico no Mahoutsukai
Ame no Machi no Teru
Felismans no Kuni
Matenrou no Locusta
Kaifuu no Silhouette