A single death is a tragedy. A million deaths is a statistic.
—Joseph Stalin as he plays Pikmin
Joseph Stalin, also spelled as Josef Stalin, and formerly known as Joseph Robotnik before he changed his last name to "Stalin", was the emperor of all of (Soviet) Russia, and he is secretly Dr. Ivo Robotnik's true father. He was raised in Soviet Russia and died in Soviet Russia.
Stalin is neutral. He doesn't care who wins: Megatron or Optimus Prime, Bowser or Mario, Thanos or Billy Mays, Peppino or Noise. (though he did play Thannos in the Asgardian Empire's reproduction of the events of the Unfinity War).
He succeeded Vladimir Lenin.
Stalin came out as gay in 1939 shortly after signing the Molotov-Ribbentrop Pact with Hitler. He only signed the pact because of his crush on Hitler. Hitler then rejected Stalin, breaking his heart. Hitler actually had feelings for Kurt Schuschnigg. One term of the pact was that these relations would not be shared with the public. This information was shared with the world in 1982. Erotic fiction written by Stalin about Hitler was uncovered the following year.
He was succeeded by Dr. Ivo Robotnik, the current leader of Soviet Russia. Then, Robotnik went back to Mobius and left Vladimir Putin in charge.
National Anthem of USSR
His official theme, which is also the anthem for his country.