Excerpts from "The Maretian" (Friendship is Magic + The Martian crossover)
GalanDun for Human boy in Starlight's dream
In Starlight Glimmer's dream on Sol 450, she dreams that she's on the surface of Mars and has to play a "Cookie Clicker" type game on a laptop. The game in her dream slowly terraforms Mars, showing all of the things that could now happen because of the work she and the other astronauts have done during their time on Mars. The boy shows up near the end of her dream. He is described as being young, but having unusually wise-looking eyes.
What do you think?
[Starlight: "This isn't real."] It could be, someday.
[Starlight: "But I didn't do this. I'm just one pony. I can't do this!"] You don't have to. [quietly] The process will go on without you, but it needed someone to make the first click.
I suppose this is as close to "young boy" as any adult male could get, myself included. If a female doesn't come along and audition for this with a voice using the same technique as Kath Soucie, Pamela Adlon, or Cathy Weseluck, it seems like you might get this role, perhaps digitally pitched up.