Lyric the Last Ancient is the main antagonist of both Sonic Boom: Rise of Lyric and Sonic Boom: Shattered Crystal. He is a giant and monstrous snake-like creature from an ancient race whose main goal is to create and strengthen a robot army in order to carry out his nefarious deeds to destroy the world. Before he could carry out his nefarious deed, however, he was imprisoned. Over a millennium later, Lyric was freed and resumed his mission, but met opposition from Sonic the Hedgehog and his crew.
- Origin: Sonic Boom
Lyric is a monstrous sized snake with green scales and brown spots around. He wears a sophisticated brown robotic chest armor with a pair of three-fingered arms. He has a rattle-like object on the tip of his tail that is a gray claw, essentially resembing a hand.
Lyric is described as darker, more foreboding and more power-hungry than Dr. Eggman. Having been driven by power, Lyric is an evil, ruthless, dangerous, pitiless, and remorseless monster, and an extremely tech-savvy mastermind. He is also rather vengeful, spending his time in his prison to plan his revenge.