Soundwave

Soundwave is a Decepticon in the Transformers franchise. He was Megatron's most loyal minion and transforms into a cassette player. Unlike the most other Decepticons, he is emotionless, but probably due to his more "robotic" character traits.

Generation One
Soundwave is the most loyal Decepticon to G1 Megatron. Like Starscream and Shockwave, he is one of the highest-ranking Decepticons, but only he obeys Megatron's commands while Shockwave is individual (or at times alert Megatron if a situation occurs) while Starscream tries to become the leader of Decepticons and replace Megatron. He has several minions similar to G1 Autobot Blastor, and his Decepticon minions are Ravage, Laserbeak, Ratbat, and Rumble. In the G1 movie, he had a very minor role where he was fighting the Autobots at the beginning, but then he must ally with the Autobots to destroy Unicron at the end of the movie. He then again was a loyal Decepticon to Megatron, who is now Galvatron.

Revenge of the Fallen
Soundwave hacks into a government satellite by releasing metal tendrils from his body into it. He then acquires all the frequencies and signals from the satellite, thus discovering the location of the last Allspark fragment and Megatron's corpse. Upon finding out, he sends Ravage to retrieve it. Then he uses the satellite to keep track of the Allspark empowered flesh creature and its parental units. He calls Sam's female batch initiator on her cellphone. She answers but cannot understand Soundwave's deep voice, so she calls him a mouth-breathing pervert and hangs up. Later, he locates Sam in Egypt via a security camera which transmitted the face to the satellite and Starscream is sent in pursuit. He isn't seen throughout the rest of the movie.

Animated
Soundwave is also in '''Transformers: Animated. '''

He is made of a more menacing character than in Generation One series and the Revenge of the Fallen film. He was created by Megatron, who tells Soundwave that humanity is now depending on robots as modern conveniences in their lives. In a similar way of the Matrix series episode, "The Second Renassiance", he controls all the robots in Detroit, Michigan to eliminate the Autobots and the humans, but Soundwave was defeated by Autobot Bulkhead and the controlled robots were back to normal. He returns again in the third season and steals the Autobots' bodies and replace them with human bodies so that he can control the Autobots and turn them into Decepticons. However, when Autobot Prowl broke free of the control, he freed the other Autobots and Optimus Prime destroyed him with his own minion Laserbeak.