Chiharu and Makina from Milky☆Subway
I made this to do animeish images, but for purists can respect the 3d style of the show no problems. Just add "3D" at the begnning of the prompt.
Not my expertise so my 3d examples are not very good, just so you know it works
Chiharu Kujo: pointy ears, antennae, red skin, colored skin, short hair, brown hair, brown eyes, sweater, off shoulder, strap, White shorts
Makina Kurusu: humanoid robot, robot joints, robot ears, gradient hair, twintails, black hair, red hair, green hair, jacket, long sleeves, yellow t-shirt, tied shirt, denim shorts