Super Yi Xing Long with his chin that would makes the Crimson Chin himself seem impotent.
In seriousness though, Yi Xing Long's design is one I really like. It has its draconic elements there such as shortened versions of Shenron's whiskers or spikes reminiscent of Porunga's that tie into him being born of a Freeza Arc wish, yet he also has humanoid elements to make him appear as his own creature. Baby Vegeta's 2nd transformation comes as a close second though.