For a while I've been thinking of what some of the colt characters would do in their futures SO I'm going to write it all down instead of leaving the thoughts to rot in my brain 

At first I thought of Featherweight and Pipsqueak. Both colts have bonded over the concept of going on adventures (Pip either earns that compass or "X marks the spot" cutie mark that artists usually headcanon him to have) and capturing the beautiful scenery. Once they have grown up, Pip moved back to Trottingham with Featherweight where they've gotten married and live in a quiet apartment room. The couple runs a blog where they talk about nice places they've been to and show photographs they've taken. Nowadays they take their photography and journalism jobs seriously, but they can still enjoy the places they've explored. Despite how Pip usually does the talking when the duo are being interviewed, Featherweight has written a whole book (which they often hint at to try and promote lol) about their pasts and adventures. In one interview they were asked what their most favorite places were. Pip would explain how it's pretty ironic how the earth pony's favorite was high up in the sky (they climbed a mountain that was higher and more risky than most tourist spots so a random village of kirin helped them up), and the pegasus' favorite was underground (basically Featherweight (Pip was left at home lol) was commissioned by Maud Pie to take pictures of her standing next to new stones and gems that she discovered before digging them out of a cave wall to study them. The sight and thought of such colorful jewels extremely deep underground just astonished him).
Featherweight is a pretty skinny stallion that is only slightly taller than average. He is able to fly, but he has a sort of condition where he can't fly vertically for too long. Ponies who didn't know about the condition at first might think he's lazy for slowly hovering instead of zipping through the sky. 
Pipsqueak is way shorter than the average stallion but he doesn't have dwarfism. He's just short lol. He often mentions A.K. Yearling, "one of the sweetest ponies you will ever meet," because sometimes she would often give them survival tips for places they want to explore, suggest spots that would make good photographs, and will even join them on expeditions occasionally.

The other colt I thought about was Rumble. His family history is a bit similar to the Apple family's history; but instead of apple farming and mostly comprising of earth ponies, Rumble's family is mostly mares. On his mother's side, there's almost nothing but mares mares mares; there were a lot of mares even on his father's side. Thunderlane managed to have the appearance of an average stallion, but cute mare figures and faces have unfortunately passed down onto Rumble. Because of this, his snout remained rounded and he's only an inch taller than the average height of a mare. His appearance wouldn't stop him from becoming a Wonderbolt, but the reason why he's still as grumpy as he was as a foal is because he's not a Wonderbolt. It's like being a big fan of an MLB team and dreaming of being one of them then realizing that it was merely a dream and you continue to be a simple fan. Poor little Rumble!

That's all I have for now  Thanks to you if you took your time to read all this