"SKULL!...Henshin..SKULL!"

"Villains who forsake their heart and bring the city to tears are no longer human. There is no saving them except from defeat. Now,count up your sins"

"Transformation is temporary death..at least that's what it is for me. Your death however,will be permanent"

"Skull! Maximum Drive!"

Through the use of the Lostdriver and Skull Memory, Sokichi transforms into Kamen Rider Skull. Skull is unique in that besides wearing a white tethered scarf he also wears a white fedora. It was created by Shroud as the prototype for Kamen Rider Double.

Skull's primary finisher is the long range shooting attack Skull Punisher (スカルパニッシャー, Sukaru Panisshā), the Maximum Drive ability of his Skullmagnum. In Skull: Message to Double, Skull is shown to have a second Maximum Drive, known only as Rider Kick (ライダーキック, Raidā Kikku), that involves releasing a giant energy skull from his chest, which stuns the opponent and knocks them back before rising into the air. Skull then puts the Skull Memory into the Maximum Drive Slot, jumps up, and does a roundhouse Rider Kick, which propels the energy skull toward the opponent, whom it bites down on. Kamen Rider Skull also appears as one of the Kamen Riders summoned by Kamen Rider Diend's Complete Form and his Gekijouban Card. In this appearance, his Maximum Drive attack is a generic Rider Kick, similar to Rider 1's famous somersault and kick attack, but with a purple swirling energy around Skull's right foot.

Having spent over a decade as a detective, Sokichi is a highly skilled investigator, possessing good deductive intuition and keen observation. Furthermore, he is shown to be an excellent mentor, having taught Shotaro nearly everything he knows on how to be a detective.

In Fuuto PI, it is revealed that as long as Sokichi becomes Kamen Rider Skull, Skull's power will grant him an immortality as a skull zombie. When he rescued Shotaro from an Antlion Dopant, his blood can't be drained as if his body doesn't have any blood at all. Saeko Sonozaki even unable to kill him unless she destroyed his Lost Driver.

#KamenRider