Yay! I've finally made up my mind on the official couples! You guys don't have to like them (as I don't have to like your couples either), all I ask is that you are respectful about it. They may change later on, but I really like it as of now. ^~^
Pinkie Pie x Twilight Sparkle
Applejack x Rarity
Rainbow Dash x Fluttershy
Starlight Glimmer x Trixie
Celestia x Discord
Luna x Queen Chrysalis
Sweetie Belle x Scootaloo
Spike x Smolder
Applebloom x Rumble
Silver Spoon x Diamond Tiara
Big Mac x Sugar Belle
Tempest Shadow x Sunset Shimmer
Princess Cadance x Shining Armor
Sunburst x Zephyr Breeze
This is all I can think of, but these are the official couples for my NextGen. Some are canon in the show and some are an unlikely pair. I'll start making their adult designs and even stories on how they eventually became a couple. Stay tuned!