If twenty-five percent of the world's population developed super-powers, then everybody will know someone who has super-powers. Often that will be someone in your family. It's hard to panic if Aunt Hortense can levitate or light the gas stove with her finger tip.
While there maybe people who can bend steel bars with their bare hands, there were be few who can transport skyscrapers or change the course of mighty rivers. (And if I read the OP's question correctly, that means none.)
There are a couple of aspects of this transformation to the global population. These supers are beginning to develop their super-powers. Aunt Hortense might start by hovering a centimetre or two off the ground, gradually she will rise higher, and perhaps eventually she might sail up to tree tops.
The supers will need to learn how to use super-powers. Strong enough to lift a car? OK. That's about a ton. So someone who can lift a ton will need to learn how to lift cars carefully, without wrecking them.
As for flying, never does anyone explain how super who can fly can do so without flying lessons. Flying an aircraft is extremely non-intuitive. Ask anyone has to fly an aircraft. Fortunately, the level of flight supers are likely to have means they get stuck in orbit or achieve escape velocity to never return. Perhaps they can only fly at one hundred metres maximum and at about running speed. or if they're lucky as fast as a fast car.
Since their super-powers have a form of biological basis, those super-powers will need to be powered and fueled by metabolic energy. They have to eat. Not all their super-powers will enable the supers to just take what they want. Soon they will slow down or run out of power, then face the consequences of their super-powered misdeeds.
Zapping your kid sister and the dog with your electrocyte-based electricity manipulation may have been fun at the time. But when your battery's flat and a pair of angry parents descend on you, it might be time to rethink junior supervillainy as a career option.
The chances are this will become a world where people, at least, a quarter of them, will be able to do remarkable things. This won't change their lives too drastically. Very few will don a mask, become a vigilante and go crime fighting. The usual suspects will use their new found super-powers to assist with their criminal activities. But the boys and girls in blue will have their fair share of super-powers too.
There will be a distinct absence of supers who can achieve world domination overnight. In some ways it will be like if 25% of the population became instant Olympic athletes. Amazing at first, amusing later on, and eventually situation normal before next Xmas.
The next generation of kids will soon be asking: how did people cope without super-powers? And they will the usual answer of we just did because that's how things were back then.
