Origin
Dr.Zachary is extremely similar to Knuckles, and is also an echidna. However, he is also half-cyborg, and has whitish fur instead of red. Zachary fist appeared in Sonic the Comic #65. He was one of the last echidna, presumably along with Knuckles.
In his first appearance, Zachary appeared to be polite and well-spoken, if somewhat emotionally distant. However, this was merely a front to hide his sociopathic and genocidal tendencies. He is completely mad and has zero empathy for others, even enjoying the prospect of killing and wreaking carnage on a global scale. He desires revenge on Knuckles’ lost people for unknown reasons, and is not above eliminating any that get in his way. He specifically stated his intention to “warm up by killing the people of Planet Mobius” and was willing to let the Floating Island fall out of the sky and crash onto the planet below“.
Zachary is a well educated and highly intelligent person, capable of advanced computer programming and software engineering. He is incredibly old, and this age initially made him quite frail and he preferred to act through intermediaries like his re-programmed robots. After the fall, he rebuilt himself as a cyborg.
Zachary possesses extensive knowledge of the Floating Island and the lost echidna people, beyond even that of Knuckles.
Creation
Dr.Zachary was created by Richard Elson, Nigel Kitching, and Nigel Dobbyn.
Current Events
Dr.Zachary is mostly in the Sonic the Comic continuity, and doesn’t appear in any other Sonic the Hedgehog media.
Powers & Abilities
Dr. Zachary possesses extensive knowledge of the Floating Island and the lost echidna people, beyond even that of Knuckles. Also, after being rebuilt as a cyborg following his fall from the Floating Island, he gained increased stamina and strength, and his arm cannon allowed him to take a more active role in his pursuit for revenge.