Takahito Saionji commands the Mobile Rescue Police, overseeing rescue operations and public relations. His sharp features include short dark red hair with a disheveled front tuft, piercing orange eyes, and a distinctive green jacket featuring black sleeves, gold trim, and a prominent "DH" badge. Known for his serious, practical demeanor, he earns unwavering respect from subordinates while remaining unflappable in crises.

As both uncle and guardian to Taiga Yagura, he shares a bond deepened by duty, alongside a school-forged friendship with Jou Kurumada. His professional rapport with Arisa Munakata surfaces through visible concern during her Synchro Fusion training. A decisive strategist, he personally greenlights perilous missions, including the Cyclone Interceptor Jet Striker’s Hyper Shot Gun deployment to save a submarine.

Trapped alongside Regal Crown president Maruyama during an AI-controlled robot siege, he relies on Taiga’s rescue. Uncovering Black Chips’ psychological manipulation, he allies with Kurumada and Shun Kuroeda to neutralize the threat. Later, he spearheads countermeasures against Ark, a rogue supercomputer endangering Earth’s axis, and coordinates the final battle from headquarters.

In the web series, he strategizes Drive Heads Mk-III upgrades. The movie reveals his calculated response to Dr. Karigari’s survival and Terra’s emergence, recruiting Mobile Assault Police pilots post-Justice Circuit sabotage. He aids Gou during the Cyclone Interceptor’s disappearance and directs Kasumi Haruno’s extraction from Terra. His Korean dub identity is Won Jin Seo.