is a fictional philosopher and politician in the Gundam stories, in which he developed Contolism, which was both about Ere-ism (that Earth is sacred and mankind must leave it and live in space) and Side-ism (all Sides are to be treated as sovereign states). This philosophy was welcomed by Side 3 (L2), which made him leader of the Side. After the Colony Republic announced its independence, the Federation responded with the Bardot Policy, which halted all resources to Side 3 (L2). Deikun responded by making the Colony Republican Guard into a full-fledged armed force. Deikun was believed to have been assassinated by his former advisor, Degwin Sodo Zabi, who seized control of the republic and renamed it in honor of Deikun in order to help draw suspicion for the murder away from himself. Zeon had two children, his son Casval Rem Deikun and daughter Artesia Som Deikun.

Because of the popularity of the Gundam series, multiple retellings of the original television story line exist (in addition to the original novalization by Tomino.) One of the more recent ones, Gundam the Origin, by Yoshikazu Yasuhiko painted him as someone bordering a fanatic. The canonicity of the manga series is, however, no more than any other version of the Gundam story line.

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