Character Concepts you wished would work in D&D?

[Dr. Cliché]

Regarding Shapeshifters, I'd like to see a shapeshifter class that focuses on a single form or theme (wolves, bears, birds etc.), which gets gradually stronger as you level up. As opposed to stuff like the current Moon Druid where any theme has to be swiftly abandoned as the power of beast shapes don't scale.
Wolf --> Dire Wolf --> Er... guess I'm a Dinosaur-Druid now.