1988: Summer Wing Ponies
Blue 'winger' with pale pink mane and tail, pink firefly symbol, pink, gold and blue butterfly wings.
Glow was the Summer Wing Pony who played the biggest part in the Pony Comic. Aside from having friends who were glowworms and fireflies, she'd often flit in and out of stories and it was Glow who was first introduced to us when the ponies were being brought into the public eye.
Glow has that annoying shade of pink hair that fades in sunlight - so any white haired Glows are sun damaged, not variants!