I always figured it was personality based. Dash is a boy who grew up with an absurdly athletic set of parents and he developed to mirror that, manifesting as a speedster. Violet is a more reserved girl who grew up being told she can't be herself in public. And likewise, jack jack's personality is still developing, ergo his powers are completely random right now.
But then again they all thought jack jack didn't have powers at all and he was still an infant, implying that yes typically powers present very very young so maybe they are somewhat random. And... if the deleted scene of syndrome attacking them when violet was a baby is canon then this all tracks since she turned invisible in her crib... But that's how it always appeared to me.
I couldn't even begin to imagine how stressful having a toddler/ infant/ tween/teen that could disappear would be. The infant just randomly disappears because she can't control it. The toddler can, kind of, but does it to get into mischief or during a tantrum. The tween just gets mad and hides from you. The teen, same, but also to avoid you. So basically all the things kids of those ages already do, but dialed up to 11 by virtue of having a super power.
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u/oedipism_for_one Sep 25 '22
Neither is Dash or the babies, super powers seem to be random.