I'm happy you ask! Since I'm not directly involved in the creation of characters, here's what I know from experience: The overall character image gets made by AI, including some of their clothing (with inpainting). That's all the AI we use. The artstyle and making layers of the character (in order to animate them in Live2D) is all done by hand. So everything does get redrawn right after using AI in order to match artstyle consistency of prior characters. This only counts for the more recent characters though. Very early works are almost entirely AI based, hence why we seek to remaster them.