Storm is lightning, though--the lightning myths has always been separate, they are elemental in nature. Lightning based powers were Sky gods, Thor, Zues--usually the most bad ass people in their pantheon. Lightning is the mythical equivalent of literal,purepower; even more unadulterated than strength. So, I disagree storm is nature based; she's elemental. And, on that note, controlling the water, or the ocean? That's also pretty elemental, it's one of the primary Pantheon foundations. And that's what I mean by myths, all of these characters are just retypes of old myths; some myths have always been more popular, just because they appeal to a broader audience.
IfAquaman were more known for literally controlling the water? We'd have a different view of him; that's more elemental in nature--like Poseidan (Which, pretty much, was Aquaman's template). Unfortunately, the comics themselves pushed Aquaman's fauna control, and not his mastery of the oceans. He just comes across as a more romantic (era) archetype due to it (At harmony with the animals!). Which, for me, just feels flat in an era of metal and machines. People haven't been scared of animals they can see in a long, long time (When animals used to literally be used for war, it was different; but even horses and elephants have given way to cars and tanks).
I'm not familiar with Namor at all, I'll have to take your word for it; but do his powers center on controlling animals, or theocean? Like if he is fighting someone, is he more likely to crush them with a tidal wave, or have flipper come around and fuck them up?