|Metal Sonic Version 4.0|
Dr. Nega (formerly)
Battling worthy opponents, furthering his own powers, etc.
Metal Blaze, both Metal Sonics (3.0, especially), and many others.
Metal Sonic Version 4.0, often abbreviated as Metal Sonic 4.0, Four-Point Zero, or simply 4.0, is a character from SolarBlaze's episodic fanfic, Knuckles' Chaotix: Elements of Power. He is a creation of Dr. Nega's, who made his debut in the fourth Elements of Power episode, Dimensional Chaos. He was built for the sole purpose of replacing Metal Sonic 3.0, who Nega began to feel was growing rebellious. He was then followed by Metal Blaze.
Metal Sonic 4.0 has a green color scheme, with "markings" on his forehead (like 3.0 does, but 4.0's are black, like Ashura's), along with striped shoes of the same color.
Metal Sonic Version 4.0 was created by Dr. Nega as a sort of "rough draft" of a new (but similar) robot that was meant to replace Metal Sonic 3.0, who he began to find unreliable and "treacherous". However, he was eventually cast aside in favor of Metal Blaze. Figuring that Four-Point Zero would still be of use to him somehow, Dr. Nega has decided to keep him around, and place him in command of mass-produced copies called "Cyber Sonics", which act as standard Badniks (similar to the Shadow Androids from Shadow the Hedgehog).
EoP Christmas Special #2
- Dr. Nega (Creator/"Father")
- Sonic the Hedgehog (Organic Counterpart)
- Metal Sonic (Base Counterpart)
- Metal Sonic Version 3.0 (Base Counterpart/Predecessor/"Brother")
- Metal Blaze ("Sister")