Doctor Eggman

Dr. Ivo Robotnik (ドクター・ロボトニック Dokutā Robotonikku), better known by the alias Dr. Eggman (ドクター・エッグマン Dokutā Egguman) is the main antagonist of the Sonic the Hedgehog series and also Snow halation pretty cure!. He wants to stop the Cures, and especially Sonic the Hedgehog, from ruining his plans to create the Eggman Empire.

Stories
Currently, Dr. Eggman only has 3 full stories.

Episode 1
Doctor Eggman drops Sonic the Hedgehog in a pit, and traps him there. Unfortunately, it was the Akiakaihana sewers. One of the manholes needed to be replaced, so Sonic got out of the sewers, and he jumps into a pool. Sonic loves the pool, but he interrupted Sonoda Umi and Kosaka Honoka's Summer break.

Doctor Eggman finds Sonic after he is introduced to Tojo Nozomi, so he traps the town in an eternal Winter.

Episode 17
Yazawa Niko and Yazawa Kokoro become big so Eggman sent some robots to stop them. Thing is, he sent in the GAIA robots, not his regular ones. Kokoro eventually gets her frozen heart cured and stops the bad guys from killing her older sister.

Episode 33
Ayase Alisa makes a deal with Eggman that she will get the Chaos Emeralds out of Angel Island and to give them to Eggman so he can give it back to their guardian, Knuckles. Alisa finds out the inconsistencies in Eggman's lie, so she doesn't give the emeralds to him.

Trivia

 * The large scientist has a large IQ of 300.