x-Brawn in the art picture.
The eldest of the three Autobot Brothers, X-Brawn is also the toughest and most adventurous. A rugged outdoorsman and cowboy type, he loves driving off-road... and uphill, and underwater, and on staircases. He's not easily surprised by fancy firepower, preferring straightforward guts. He's chivalrous enough to apologize to women drivers before he ejects them through his sunroof.
His alt-mode is a Mercedes-Benz M-Class SUV.
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Bumblebee in Mercedes-Benz M-Class SUV Mode.