In the early modern times, Larry have finished college in california. He manages to keep up with his parents physically. His Parents are sadly seen their son ate the Devil Fruit was to risky to cure him.
Larry's Ability was a mystical fruit found in the world that can give the eater many different and varying kinds of strange and interesting abilities depending on the type and variation of the fruit itself.
There are some seen only in the anime and different ones seen only in the manga. However, most of them appear in both and are crucial in the storyline where many main characters possess their powers.
According to Oda, a "certain professor" will explain the complex mechanisms behind all of the Devil Fruits in the series in the near future.