Dr. Eggman

Dr. Ivo J. "Eggman" Robotnik is an angry scientist and brilliant Genius with an IQ of 300 (Whatever that means) since canon games from Sonic 1 to Mario & Sonic at the London 2012 olympic Games and Sonic & Sega Allstars Racing: Transformed.

What J stands for. ..
Most Sonic fans don't remember what J stands for although in SATAM DiC cartoon series, it was revealed to some fans that he was also called "Warlord Julian".

When he met King Bowser Koopa
He and Bowser have been best friends since his elementary simester at the Super Smash Bros. Video Game Academy. They also met the Second Time at the Olympic Games in Beijing, China, third time in Vancouver and the 4th time in London. They even met the fifth time at the Bad-Anon Meeting in the Wreck-It Ralph move. And is also best friends with Clyde the Orange Ghost from the Pac-Man Series.