to keep close to his old design try any of these - or put in Neg to reduce chance - SFW/NSFW
may need to add 3d, or realistic, in neg for 2d/anime styles due to having more 3d image training
due to his appearance he - may be mistaken for a girl - so some female charged styles may need 1girl, in neg - flat chest, or 1boy, in prompt,
May provide another update soon - to fix some issues with hair colors and accessories
try any of these for default look - or put in Neg to reduce chance (making changes)
face/body
Eternity, purple eyes, or black eyes, blue hair,
perhaps topless male,
suggest green hair, in neg,
Outfit
blue jacket, white gloves, black shorts, necklace, earrings, shoes