Soundwave & Laserbeak. I always thought Soundwave was Megatron's "Second in Command" and not Starscream who was actually Third in Command. Soundwave obeyed orders, completed his assigned tasks and was loyal until after Megatron's (supposed) death. He may be a Decepticon but he never disobeyed Megatron or questioned his command orders. He usually accomplished his missions with perfection.