@DarkObsidian
Marble HAS personality. She is Shy and a bit of a coward, but she loves her sisters. No matter if she has just suffered a heartbreak, she will put it aside and help Pinkie find the perfect gift. She will aid Pinkie if latter is troubled by something. She is shown to understand other shy individuals (big mac) and warms up to them quickly. Unlike Fluttershy (who still is jumping between being Flutterbitch and a dormat), Marble feels geniuenly shy. She has her “safety bubble” which would be a rockfarm and her sisters, and once something bursts the bubble, Marble is kinda hopeless. She was an interesting match for Big Mac, who is shy, but also brave. He, too, cares about his family and is ready to do everything for them (even work when he is injured). They have alot in common, and thier relationship would be much more interesting than akward Big Mac and bland Sugar Belle.