(I know you can’t really see his cutie mark on his flank because of his wings, but you get the general idea of the placement lol also, I put a background on the full cutie mark because I was afraid the white streak of light wouldn’t be very visible with DA’s whiteish background)
 
Name suggestions: Prism Swift, Prism Guide, Promising Prism, Prism Promise
 
Character suggestions: His cutie mark represents his optimism and his ability to make even the most pessimistic creatures hopeful. Always had a can-do attitude in every situation. He makes friends very easily and loves to be the center of attention. He knows things work out not just because he’s optimistic, but also because he will work towards whatever he wants in life. Not one to sit around for too long, always up and ready to party or get to work. Would make a great motivational speaker.