Fan Casting T. Rexpy in Sort by Tropes

Tyrannosaurus rex is one of the most famous, fearsome and majestic creatures that ever lived on Earth. In a story featuring giant monsters, T. rex is an obvious choice. However, some authors just find that T. rex itself is a little too cliché and want something more original, or that using a real dinosaur species just wouldn't fit the setting. So instead of using the tyrant lizard king itself, they show an original creature that obviously resembles it, resulting in something of an Expy of T. rex — a T-Rexpy.