Doctor Eggman

"Dr. Eggmman, a genius scientist, is always hatching plans to take over the world. He was allegedly in the process of attempting to make use of Emerl for an unknown purpose..."

Dr. Robotnik (ドクター・ロボトニック Dokutā Robotonikku, lit. "Doctor Robotnik"), better known by the alias Dr. Eggman (ドクター・エッグマン Dokutā Egguman), is the main antagonist of Sonic Battle. He is a human and the arch-nemesis of Sonic the Hedgehog. As an obese scientist with an IQ of 300 who dreams of dominating the world, his constant plots to create his Eggman Empire are endlessly thwarted by Sonic and his friends.

In Sonic Battle
Having used research notes made by Gerald Robotnik, he managed to locate a doomsday weapon known as a Gizoid. However, he eventually discarded it when it seemed to be useless. He later discovered that the Gizoid can only be activated by Chaos Emeralds and tried to get it back. Eventually, he managed to make copies of the Gizoid, rechristened Emerl. He eventually unveils his Death Egg, and uses its cannon to destroy a star. However, he becomes horrified when he learned that Emerl, due to his learning abilities, not only managed to learn the Death Egg's cannon at sight, but also aim the weapon directly at the Earth. He later witnessed Sonic being forced to kill Emerl.

Moveset
Eggman is only playable after entering a Gameshark code. He can only use 2 attacks: 1)Fire homing missiles. 2)Drop a bomb. This moveset is based on how he is fought in the Death Egg.