First there's Heatwave, the manly leader of the group. Not very fond of humans (especially his partner Kade), but willing to give them a chance thanks to Cody's persuasion. He doesn't like the idea of being assigned to such menial tasks as search-and-rescue missions, as he'd much rather be out in the field of battle helping Optimus and his fellow Autobots in the conflict against the Decepticons. But, his spark's always in the right place, and he's willing to do what he must to ensure that no one gets left behind on his watch. He may be rough around the edges, but inside that serious exterior beats the spark of an Autobot.
Next up is Chase. Being a police car, it's natural that he's into law enforcement and protecting the innocent. He gets along well with Chief Charlie Burns and is always prepped for a mission. He shows a keen interest in helping others and keeping everyone safe, so long as they abide by the law. He also seems to be the quietest and most soft-spoken of the team, never raising his voice or getting all that angry at others. But then again, he's got sirens on his shoulders to make himself heard.

Then there's Blades. Blades was a nervous wreck the moment he scanned his helicopter altmode. Back on Cybertron, he was a ground-based vehicle, and so he had never flown before prior to coming to Earth. It doesn't help that he happens to have a great fear of heights, and that he's partnered with the flying-lover Dani (who's apparently quite rough on his joystick. Heyoooo...

Finally, there is Boulder. The moment he stepped off the ship and set foot on Earth, he was intrigued. Of all the Rescue Bots, he's the one with the most interest in Earth and its culture. He finds human beings most curious creatures, which just enhances his own curiosity about them. He's a little like Animated and Prime Bulkhead, showing an interest in art and beauty, as he was once hesitant to move some plants from a museum during a mission because it would "destroy the harmonious nature of the plaza's design."

So, that aside, who's you favorite and why?
For me, it's Heatwave. I like how he's such a sharp contrast to what a character in this kind of show would be like. He's pretty much like what Wolverine would act like as the head of a day care center... except if he were a giant robot.

