Snarl

Snarl is an unhappy, unsociable loner. He grudgingly follows Grimlock's orders and that's about it. He leaves thinking to others. He has few opinions and rarely expresses those he has. Snarl's uncommunicative nature only serves to fuel his sense of isolation. On top of all this, he hates the ungainly stegosaur form given him by the Ark and feels that the war on Earth means he may never see his beloved Cybertron again. Snarl is a profoundly unhappy being.

Only in war does Snarl feel happiness. Only the joy of combat washes away the ache in his spark, and lets him forget anything but the rising thrill of the fight. For these reasons Snarl revels in combat more than even his fellow Dinobots.

(Source: www.tfwiki.net)