Short answers, pulled from the story.
Tokido is a Japanese fighting game player known for competing in the King of Fighters and Street Fighter franchises. He has also competed at a high level in Tekken, Marvel vs Capcom 3, and BlazBlue.
Tokido has won Evo's top prize three times, taking Capcom vs. SNK 2 in 2002, Super Street Fighter II Turbo in 2007, and Street Fighter V in 2017.
The Tokido Vortex is a sequence of moves Tokido invented while playing Akuma in Street Fighter IV. The setup nearly guarantees the opponent takes damage once it starts.
Tokido was released from Mad Catz in 2016 because the company was in financial trouble due to poor sales of Rock Band 4. Echo Fox confirmed it had signed him on the 4th of January 2017.
Tokido is considered one of Japan's five "fighting game gods." He shares that title with Daigo Umehara, Shinya Onuki, Tatsuya Haitani, and Naoto Sako.
Tokido has reached the top eight at Evo 28 times, a total surpassed only by Justin Wong. He holds Evo medals in 12 different fighting games across more than 20 years.