Weight: 1.0
Trigger + Appearance: witherskeleton, dark skin
Default Outfit: hat, black jacket, cropped jacket, underboob, short sleeves, black gloves, elbow gloves, black shorts, short shorts, black thighhighs
Add black hair if necessary.
The results of your generations are dependent on the additional LoRAs, weights, and models you use, so it may not work or come out as consistent as my sample images.