Ultra Magnus feels he is a soldier and nothing more. He very much prefers taking orders to giving them, and even avoids opportunities for higher responsibility. But when he is forced into those opportunities, he betrays his real talent for the job. He's strong, resolute, dependable, selfless, and courageous. Sadly, Ultra Magnus is the only Autobot who doesn't realize this.
Believing he is nothing but a soldier, Ultra Magnus is perfectly willing to sacrifice himself for the greater good if need be. He knows he's more powerful than the average Autobot, and will throw himself at larger threats accordingly.
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