Here’s a couple of teens in my verse~
 
Meet Jellyfish and Sea Breeze, the twins of Scootaloo and Terramar! Their family lives primarily in Seaquestria and the boys have only visited land a handful of times. Jelly and Breezie are two peas in a pod and tend to stick very close to each other in social situations, even though their personalities tend to vary from one another. The eldest, Jellyfish, is very much a “go with the flow” kind of character. He believes heavily in vibes and auras hidden in the world around him, and is known to meditate often to keep any stress down. Sea Breeze, on the other hand, is an active and excitable boy. He’s always zooming around underwater, sending neighbors spinning in his wake. He apologizes for this, if only because he grew up learning good manners, but continues to speed through life with maximum energy. And if Jellyfish is ever taking a swim with his brother, Breezie is always sure to zoom forward and speed back, just to make sure he never leaves his bother behind.  
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These two are the oldest of the CMCs kids (not including Spike or Gabby) and have a few good years on other CMC next gen! I hope you like ’em~