NovelAi recently added a tool to recreate the appearance of original characters, so I've been testing it out a bit and the results have been pretty good. In addition to improving the combination for the style, the base remains the same. I've just added more things, and I think it looks much better on some characters than on others (like Makima, where I only used a few things to enlarge her breasts). Of those characters, the only one NovelAi recognizes is Pop Step; the others were created using the tool.
cecilia irene-gundam
Erin Danua-i killed the player of the academy
Miruam-i killed the player of the academy
Gu Xian'er-i am the fated villain
Han Hari-The Knight King Who Returned with a God
Kaori-Anata ga Nozomu nara
Mener-the last adventurer
Mira-adelaide inn
Yumi-Nt00
Since the tool consumes coins to use it, I will try it out every time my subscription is about to expire. I still need to test how well other characters from doujins work.