Ghost Mage, approximately level six. The main strength lies in its ability, something like mind control, and here are more details. Mind control is allowed one-on-one, while the banshee itself is inactive and has a disadvantage in terms of health or armor. Mind control itself does not reduce initiative. Here, we need to think about balancing the number of banshees = the number of puppets +(-) their level. For atmosphere, you can add a banshee's scream and, I don't remember exactly, something like incorporeality, in short, like ghosts, and to avoid imbalance, vulnerability to magic. As for the texture, I have an idea to take the hair of dark elves, attach it to a lich, and repaint everything in dark blue tones.