Wednesday Boy
The Nerd WhoFell to Earth
What about reskinning the stormsoul genasi to be half-storm giants that have settled in the rolling hills at the foot of the storm giants' mountains? Part of the storm giants' heritage got passed to the half-storm giants, which is where their lightning powers come from. And you could treat their size like goliaths--they're still a medium creature but they're ~7 1/2 feet tall.