Fan Casting Cool Uncle in Sort by Tropes

Lots of fictional families seem to have that one uncle that all the kids just love. Most often, he's a youngish bachelor with no children of his own and has no intention of settling down any time soon, though he may be romantically involved. He may travel a lot and wow the kids with stories of meeting celebrities and traveling the world (and if so, he always brings back the coolest souvenirs, which he naturally gives away as presents), and he's much more free-spirited than the kids' straitlaced parents.