Eccentric roboticist and primary antagonist, obsessed with capturing Sonic for his power.
Their rivalry drives the main conflict.
Dr. Robotnik ambushes Sonic after escaping the mushroom planet and later uses the Master Emerald's power to attack him.
The transformed hero defeats Robotnik's ultimate weapon.
Super Sonic fights and destroys the giant robot created by Robotnik, causing Robotnik to collapse with it.
Tails directly supports the resistance against Robotnik.
Tails helps Sonic oppose Robotnik's plan to steal the Master Emerald and later fights his robot and drones.
They cooperate for a shared objective.
Robotnik forms an alliance with Knuckles to track Sonic and steal the Master Emerald.
Stone serves as Robotnik's established assistant.
Robotnik reunites with his assistant Agent Stone after arriving back on Earth.
Explore the full interactive character relationship map of Sonic the Hedgehog 2
Related entry on Wikidata (Q1996763), public domain (CC0).