The Autobots' resident hothead, Bumblebee's fiercer, more aggressive, less milquetoast brother, Cliffjumper was always my favorite non-Prime number. His candy-red paint job reflected the barely-suppressed anger that fueled this small but tough customer. Nobody wanted to go home more than Cliffjumper. He had little patience for the mewling humans of Earth, and his burning desire to end the war and get back to Cybertron led him to some rash, even foolhardy decisions. Hey, he was homesick. It does things to a guy.
I always found it particularly awesome that he was voiced by the late Casey Kasem, and in the classic animated film they even gave him a literal countdown to do.