They were much more than just pranksters. Yes, they loved the jokes and the laughs, and sometimes at other peoples' expense, but they were never cruel, and they never wanted to hurt people just to see them hurt. And they were amazing big brothers.
Book VII from Fred and George sucks. I sorta expected Dumbledore to Obi-Wan on us (that's the way Heroic quests flow), but Sirius and Dobby, I thought it couldn't get worse. Fred was the worst. - Harry Potter / Fred 'n George Weasley.