Soundwave

Soundwave was a Decepticon and was very loyal to Megatron. He was very powerful and spoke no words though he was the communications officer.

Appearance
Soundwave was a black Decepticon with dark purple highlights and many points indicating that his Vehicle Mode (transformation) could fly. He also had a small drone called Laserbeak that could come off his chest if he needed surveillance in more than one area at once, though he didn't use it often. He also had two 'tentacles' that he sometimes used for attack, to grab things, or simply when he needed to type faster. His Vehicle Mode was a deep purple/black rocket that had wings and also had many rudders at the back.

War on Cybertron
Not much is known about Soundwave's time on Cybertron during the war for Cybertron. But what is known about him is that he supported Megatron from the beginning and that he was present when Bumblebee's voice box was ripped out. It is highly likely that Soundwave was the Communications Officer for Megatron during the war as Ratchet mentions him when he tells Jack the story of Orion Pax along with Megatron/Megatronus.

Time on Earth
Soundwave spent most of his time on the Decepticon Warship where he was the communications officer. The only times he left the Warship was for important tasks such as when Megatron needed him to use the Long Range Satellite System to locate Cybertron for the Spacebridge.

Behind the scenes
Soundwave is on of the few characters to have been picked from the original series "Transformers".