Character requests for 3 remaining unidentified characters:

• Roxy Migurdia - Mushoku Tensei
• Simon - Tengen Toppa Gurren Lagann
• Kotobuki Hisako - Seitokai Ni Mo Ana Wa Aru! Thanks Fiv
• Bakugou Katsuki - Boku No Hero Academia
• Kuze Shizuka - Takopii No Genzai
• Haruhara Haruko - FLCL
• Miyamizu Mitsuha - Kimi No Na Wa. Thanks Wielder0182
• Kitagawa Marin - Sono Bisque Doll Wa Koi Wo Suru
• Frieren - Sousou No Frieren
• Itadori Yuuji - Jujutsu Kaisen
• Oyama Mahiro - Onii-Chan Wa Oshimai!
• Ooto Ai - Wonder Egg Priority
• ???
• Mash Burnedead - Mashle Thanks NWF Renim
• Roronoa Zoro - One Piece
• ???
• Oguri Cap - Umamusume
• Otori Tan - Seitokai Ni Mo Ana Wa Aru! Thanks Fiv
• L - Death Note
• ???
• Akiyama Mio - K-On!
• Johnny Joestar - Steel Ball Run
• Amate Yuzuriha - Gundam Gquuuuuux
• Kiriyama An - Mono (Afro) Thanks kookieman4
• Reze - Chainsaw Man

Seven is mitsuha from your name

After Simon is Kotobuki Hisako - Seitokai ni mo Ana wa Aru!.
After Oguri Cap is Otori Tan - Seitokai ni mo Ana wa Aru!.

i think second to last is kiriyama_an

Between Ohto Ai and Mash is probably Sung Jin-Woo