G-merl, also known as Gemerl, is one of the main antagonists in Sonic Advance 3. He is a Gizoid created by Dr. Eggman from Emerl's data, making him a revised version of his predecessor. G-merl once aided the doctor in his attempts to stop Sonic and his friends from foiling one of his plans, but wound up betraying Eggman to cause mayhem. After his defeat, he was reprogrammed in the image of his predecessor.
An ancient robot called a Gizoid that can learn to copy the traits and skills of others; G-merl is a unique model that can also absorb Chaos energies. He is stated to have wiped out the civilization that made him. However, he picks up better traits by hanging out with Sonic and his friends — but has to be destroyed once his old programming kicks in.
G-merl is a humanoid, mostly black, robot. He possesses five-fingered gray hands and feet in the shape of shoes with black soles and yellow lines around them. His upper arms, abdomen and thighs are gray, and he has spherical black joints as shoulders and pelvis-leg joints.
G-merl lacked any emotions besides following Dr. Eggman's orders to battle Sonic and friends. However G-Merl turned out to have a will of his own once he saw all 7 chaos emeralds and promptly betrays his creator.
After his defeat and being reprogrammed by Tails, G-merl displayed a kind-hearted nature and is now living with Cream the Rabbit at her mothers (becoming more akin to his predecessor). There is a small scene after end credits in the true ending, where G-Merl is seen consoling Cream after the young rabbit trips and cries, helping her up.
- After Sonic Advance 3, G-merl was never seen or mentioned again.
- In Sonic Rush, he is nowhere to be seen, despite living with Cream and her mother.