Disclaimer: Latest update: port to Illustrious with better tagging. Illustrious and Pony versions use different tags and triggers.
Also, the Illustrious version might require adding "between breasts" into negatives to prevent some odd artifacts.
Special mention: Tyberzandari for Illustrious version testing and some preview renders.
Illustrious New Tags:
Illustrious Weight: 1
Trigger: arbit3rthelov3rs
Character: grey hair, medium hair, forehead mark, ahoge, angel wings, animal ears
Outfit: white cape, side cape, white dress, long dress, cleavage, elbow gloves, cleavage cutout, ankle boots, footwear ribbon, neck ribbon, purple ribbon, white gloves, wrist cuffs, white footwear, center opening, clothing cutout, navel cutout, fur trim, strapless dress,
Might require higher weight to be used together: mechanical halo, fur hat
Put this in Negative Prompt: between breasts,
Old Tags for Pony Version:
Pony Weight: 0.8
Trigger: arbiter the lovers
Character: white hair, short hair, forehead mark, wings, mechanical halo, animal ears
Outfit: white capelet, white dress, long dress, cleavage, clothing cutout, white elbow gloves, cleavage cutout
For Pony version for some reason if I use mechanical halo tag, her hat refuses to show up, could be a problem with the checkpoint itself but you can try experimenting with tag weights.