Metal Series

Created by Dr. Eggman, Their purpose is to "assist" the Dark Egg Leigon as Dr. Eggman said it. They are highly weaponized and very dangerous.

Mecha Sally
Mecha Sally was roboticized by herself to prevent the World Roboticizer from doing its purpose. Although she succeeded, she has been shown to expose the hearts of the Freedom Fighters. She was weaponized by Dr. Eggman.

A joke was put in Off Panel where Mecha Sally and Metal Sonic marry. This couldn't happen, because robots have no feelings.

Metal Sonic
Metal Sonic is just as dangerous as ever! He was the first metal to be created. He has been used to self destruct many times however, instead of wrecking havok.

Metal Knuckles
Metal Knuckles shares many of the same abilities as his counterpart, Knuckles. He is most likely weaponized, however, making him very dangerous.

Metal Tails
Metal Tails is the only new Metal in the series. He, like Metal Knuckles, shares the same abilities as Tails, and then some.