I have this same problem (or blessing). I have my two protagonists Takashi and Yuno but I kinda got attached to Yuno’s friends Nao and Azariah.
Nao is just so relatable and fun. His design is fun to mess around with too since it’s so flexible-able. So you always see him in a different outfit from his reference sheet. Some pictures
Then there is Azariah. I love Azariah because she’s very mysterious and morally ambiguous. She also isn’t the character that she presents to people and in my story I hint at it a lot. Her relationship with her boyfriend is also something fun to play around with when writing.
My story revolves around demons and angels but the people I have the most fun with are the human characters.
Grimlord (temp name) is currently in the works so there is isn't any-place to read it but I do plan on posting mini comics and more artwork on my instagram and twitter.
Socials:
Instagram: https://www.instagram.com/simplegray_owo/
Twitter: https://twitter.com/grumpysimple
Toyhouse: https://toyhou.se/Simplegray_owo