I can't tell if Leon's short or they're implying Sonia's a bit older. Probably the former.
Leon was 10 when he became Champ, so Sonia'd be a kid then, too.I already had a lot of random dreams about cartoons I watch, like some crazy crossovers that would never happen irl, some were kinda cool ngl XD
Getting back on topic:
Young Leon and Sonia are so adorable :3
They say something about their past as kids in the games?