Sougo Tokiwa (常磐ソウゴ, Tokiwa Sōgo) is the name of multiple characters mainly portrayed by So Okuno in the Kamen Rider Series, as well as their Rider transformation, Kamen Rider Zi-O (仮面ライダージオウ, Kamen Raidā Jiō).
- The prime Sougo Tokiwa is the main protagonist of Kamen Rider Zi-O and appears in nearly all media involving the character.
- A version of Sougo Tokiwa from three days in the future appears exclusively in episodes 11 and 12.
- A alternate timeline version of Sougo Tokiwa appears exclusively in Kamen Rider Zi-O: Over Quartzer and Kamen Rider Zi-O: Final Stage.
- A version of Sougo Tokiwa from Mirror World appears in Episodes 21 and 22.
- Sougo B, C, D, E, and F appear exclusively in Rider Time: Kamen Rider Zi-O VS Decade.
- A robotic version of Sougo Tokiwa appears exclusively in Rider Time: Kamen Rider Decade VS Zi-O.
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There are other versions of Sougo Tokiwa who have been portrayed by other actors:
- SOUGO Tokiwa is the main antagonist of Kamen Rider Zi-O: Over Quartzer, and was portrayed by ISSA.
- Ohma Zi-O is a future version of Sougo Tokiwa, and is voiced by Rikiya Koyama in all of his in-suit appearances.
- In the TV series (including Over Quartzer and Kamen Rider Zi-O: Final Stage), his elderly appearance is portrayed by suit-actor Seiji Takaiwa.
- In Decade VS Zi-O and Zi-O VS Decade, his childly appearance, known as the True Sougo is portrayed by Shunta Ito.
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There are also two other versions of Sougo Tokiwa in Novel: Kamen Rider Zi-O, and do not have a specific actor due to its text format.
- Sougo Tokiwa (The Fourth History) - A variant of Sougo created by the Third Woz's interference in the timeline.
- Inner Sougo - A dark personality of Sougo Tokiwa and his mirror world counterpart. He serves as one of the main antagonists of the novel.