Kamen Rider GrandZi-O is Zi-O's primary final form accessed with the GrandZi-O Ridewatch. It wields the power of all 20 Heisei Kamen Riders. In this form, Zi-O is adorned with statues of all the previous Heisei Riders, with his own on his crown. Sougo is an ambitious young highschooler with a strong desire to become a king, being influenced by a dream he saw during his childhood. He is kind and respectful, usually omitting honorifics toward elders. He also doesn't really like anything sexual