Soundwave
Soundwave is a schemer and opportunist. His hearing is exceptionally acute; he can read minds via brain impulses; he can detect even the lowest energy transmissions. And everything he catches wind of, he uses as blackmail material. No wonder his fellow Decepticons hate him.
He's also the communications officer, so despite his personality he gets to answer children's letters.
Fiction
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Along came a Spider
The Cybertronian civil war reignited on Earth, though both factions struggled with adapting to the strange energy resources of the planet. During a battle, the Decepticons kidnapped one of the Autobots' new human allies, Sparkplug Witwicky, 
under the belief he could convert fuel for them. Under threat of violence, Sparkplug decided to co-operate, listing to Megatron the resources he needed.
The Decepticons' acquirement of these resources was anything but subtle — Soundwave in particular waltzing into the University of Oregon to stealg a large chunk of its chemistry department – and their destructive escapades ended up attracting the attention of the planet's governments and news media. Monitoring the humans' radio frequencies, Soundwave reported to Megatron that the United States Army had surrounded their mountain fortress. Megatron dispatched Starscream, Skywarp, and Thundercracker to deal with it.
What the Decepticons had no way of predicting was that the fortress would be infiltrated by the Autobot Gears and his new ally, the human superhero Spider-Man. Soundwave detected the intruders using his keen senses.[note 1] After Gears and Spider-Man bested Ravage, they were faced by Soundwave, who tried to zap the fast-moving wall-crawler with his blaster. This gave Gears the opportunity to clock Soundwave while telling him he had no friends. Leaving Soundwave unconscious, the two heroes went on to rescue Sparkplug. Prisoner of War!
