Trivia / Kamen Rider Outsiders

• Acting for Two: Yuria Haga plays two different characters, she reprised her role as Mari Sonoda from Kamen Rider 555 and also plays as the Orphnoch Smart Queen who first appeared in Kamen Rider Zero-One: Kamen Rider Genms -Smart Brain and the 1000% Crisis-. It is a Significant Double Casting because off screen pre-story the latter copied the appearance of the former.
• Meaningful Release Date: Episode 4's trailer (which reveals that Tachibana has finally unlocked Garren King in canon, 19 years after Blade and eight years after the SIC Hero Saga explored the concept) was released on August 22nd, 2023, the 19th anniversary of Garren Jack's debut.
• Role Reprise:
  • From Kamen Rider Ryuki:
    • Takashi Hagino as Takeshi Asakura
    • Tsuyoshi Koyama as Kamen Rider Odin
  • From Kamen Rider 555:
    • Yuria Haga as Mari Sonoda, in addition to her portrayal of Smart Queen.
    • Hiroshi Yanaka as Arch Orphnoch
  • From Kamen Rider Blade:
    • Kousei Amano as Sakuya Tachibana/Kamen Rider Garren
  • From Kamen Rider Den-O
    • Yuichi Nakamura as Yuto Sakurai^SPOILERS!This Yuto is an Alternate Self of his main timeline counterpart.
  • From Kamen Rider Decade:
    • Kimito Totani as Daiki Kaito/Kamen Rider Diend^note Totani voiced the character in the suit.
  • From Kamen Rider Drive:
    • Shota Matsushima as Brain/Kamen Rider Brain
    • Masakazu Morita as Tenjuro Banno
  • From Kamen Rider Ex-Aid:
    • Tetsuya Iwanaga as Kuroto Dan/Kamen Rider Genm
    • Reina Kurosaki as Nico Saiba
  • From Kamen Rider Zero-One:
    • Nachi Sakuragi as Gai Amatsu/Kamen Rider Thouser
    • Syuya Sunagawa as Horobi/Kamen Rider Horobi
    • Show Hayami as Ark/Kamen Rider Ark-Zero
    • Myra Arai as Rin
  • From Kamen Rider Saber:
    • Eiji Togashi as Ren Akamichi/Kamen Rider Kenzan
    • Kōki Uchiyama as Desast
  • From Kamen Rider Revice:
    • Noritaka Hamao as George Karizaki
  • From Kamen Rider Geats:
    • Kokoro Aoshima as Tsumuri
• You Look Familiar: Tōru Ōkawa (Zein) previously voiced the Snowman Imagin from episode 45 of Kamen Rider Den-O and Mummy Legendorga from Kamen Rider Kiva: King of the Castle in the Demon World.