Times Are’a Changing
WB — OOC(here) — IC
Throughout history there are records of people holding near magical abilities. These people were all superhuman or Supers as they would later come to be called. These stories and records were all relegated to being myths and made-up. This belief publicly changed in the early 20th century when, in 1917, a Super called the Colonel came into prominence. He was a Tank Commander taking part in the Battle of Arras: more specifically he was part of the assault on Monche-Le-Preux. The tanks assaulted the position in the middle of the night not knowing the assault time had been changed; they went in and for a while they were successful.
Then the defending force became aware that the tanks had no infantry support, and they stormed the tanks causing much devastation. That, however, was not the worst of it: the Allies had ordered a bombardment on the area. It was as he saw enemy and ally alike dying around him that his powers fully manifested. Up until that moment he was not able to do much actively, only being able to roughly sense where metal was. After that, however, he became capable of so much more. He lifted the charred carcasses of the tanks around him and formed them into a massive dome that could be seen by anyone observing the battle.
Prior to this the existence of Supers had been kept a secret, mostly, being only known of in rumors. After this they emerged into public view, both in their home countries and in the battlefields of the Great War. For a time there was much restlessness with the sudden revelation of Supers, but they did much good in the Great War, and during the period of armistice that happened in between World War One and World War Two. Soon enough nearly every major country of the world had their own forces of Supers.
During the Second Great War, every country involved, or nearly so, sent Supers in to fight. Some sent more than others, or sent them in secret on certain covert missions. While they were involved, they did not become a major part of the fighting until a covert mission discovered just why Germany and her allies had so many Supers. They had been performing experiments on people, to create Supers. Up until then having superpowers was considered a privilege of birth by many and luck. Nazi Germany was able to discover what it was that gave Supers their mysterious abilities.
I have some links that may help with powers and character creation. Backstory Generator, another one, and bits from these generators could help as well. Some give general ideas; others do the same while describing the appearance and personality. More importantly here is the link to the Superpower wiki page for a resource concerning powers.