Even more trans characters from shounen and seinen manga. Some are headcanons- those are indicated by question marks. Organized roughly by year.
Manga version part 1:
here
Manga version part 2:
here
Anime version:
here
Not on MAL (yet):
Sayonara Chinchin Welcome Manman ~OL ni Naritakute Seibetsu Tekigo Shujutsu shimashita~ (2019)
Yoriko "Yoripi" Kamikawa (trans woman) (protagonist)
Otto wa Jitsu wa Josei Deshita (2020)
Wafuku Tsushima (trans woman) (main)
Bokura no VR (2020)
Miharu Akina (trans boy) (main)
Ore no Karada wa Nande Onna Nanda? (2020)
Ryuutarou Suzumiya (trans man) (protagonist)
Haru to Yakyuu (2023)
Haru (trans girl) (main)
(bonus shounen/seinen manga- not labelled as shounen/seinen on MAL, but are on other sites, so IDK)
Break the Border: Rebirth of Echoes (2018)
Sei Igarashi (trans boy) (protagonist)
Fukakai na Boku no Subete wo (2018-2021)
Mogumo (agender) (main)
Mei Tatebayashi (trans girl) (supporting)
Sacchan Iwaoka (trans woman) (supporting)
Ayumu (trans woman) (supporting)
Yamashiro (non-binary or trans man) (minor)
3-Partner Hajimemashita!! (2018-2021)
(name removed for spoilers) (trans woman) (main)
Kanojo ni Naritai Kimi to Boku (2018-2020)
Akira Yonezawa (trans girl) (main)
Josou shite Off-kai ni Sanka shitemita. (2020-2022)
Rina "Kametarou" Amakusa (trans woman) (main)
Jibun no Karada wo Yurusu made (2020-2022)
Poppy Pesuyama (x-gender) (protagonist)
Kemomi (x-gender) (supporting)
Haikei, Sekensama. (2022-2023)
Kanesho Tachibana (trans boy) (protagonist)
Villain (2023-2024)
Azuru Orio (non-binary) (main)
Otoko wo Yametemita: Gan ni Natta node Josou shite Koi wo Suru Koto ni Shimashita (2023-ongoing)
Uchikiri Kamen (trans woman) (protagonist)
Telomere (2023-ongoing)
Yuki (trans girl) (main)
Concept Café-jou wa Koi wo Kiru (2024-ongoing)
Tao (trans woman) (supporting)