Made this as a reply to a comment on another image, but I thought it was good enough (and pony enough) to upload. Had some fun designing each variation of Trixie; tried to strike a balance between her original designs (from the show and EQG) and Dio’s designs, and I think it worked well enough.
 
Counterpart comparisons, clockwise from bottom right:  
Trixie Lulamoon - Dio Brando (Part 1)  
TRIXIE - DIO (Part 3)  
Ultimate Ascension Trixie - Heaven Ascension Dio (Eyes of Heaven)  
Alternate Bellatrix - Alternate Diego (Part 7)  
Bellatrix “Trixie” Lulamoon - Diego “Dio” Brando (Part 7)