Ok after asking the dev, he wrote that it is no problem posting the pictures of the other three characters here. (It really feels better to do this with permission :coldsweat
Further he wrote that he will provide an update tomorrow evening (information without guarantee)
Heroine WIP - Madeleine
"Madeleine was one of the first three heroines alongside Eunha and Priscilla when I envisioned the game initially. You can find some early renders of her I published online awhile back. Her archetype basically is of that of a Tsundere Tomboy Goth chick. Her story ties deeply with Pre-reincarnated MC's past and you explore that. She's set to be introduced in one of the future updates."
Heroine WIP - Lee Eunha
"Eunha was one of the first three heroines alongside Madeleine and Priscilla when I envisioned the game initially. You can find some early renders of her I published online awhile back and the difference is large. Eunha's archetype is that of the Nerdy Shy chick with a hidden personality. Unlike Madeleine, she doesn't have a deep relationship with Pre-reincarnated MC but they have another kind of relationship. What that is? It's for you to find out. She's set to be introduced in one of the future updates."
Heroine WIP - Margaux"Ah, Margaux. She's one of the newest characters I've created. Her story doesn't relate in any way to the reincarnated MC but she's related to the Past MC, her niece. Her story ties you back to your old self and what happened afterwards to those you left. Her archetype is that of a Meek Clutzy and just all-around adorable girl. Also, she has huge boobs."