A teeny velvet drop of water. Perfect for babies.
She flies! She swims!
She twirls, she freezes, she melts, she foams, she boils, she evaporates, she demultiplies to infinity or merges in one instant, she puts out fires (and sometimes flows from my eyes). Stronger than all the superheroes combined, it's a water droplet.
PS: Under her "i'm indestructable and superstrong" looks, Water droplet is a fragile and precious little thing, even rare or cruelly absent in some corners of the world. She deserves all our attention. Lets preserve her!