ユーリ

Yuri is a character appearing in Kamen Rider Saber. He is the mysterious Swordsman of Light from an ancient past.

In his past, Yuri won a holy battle after he became one with the Sword of Light, but at the cost of his humanity. He has remained in the world of Avalon since then.

After meeting Kamiyama Touma in Avalon and having witnessed his resolve, Yuri departs from Avalon and enters the real world. Yuri is curious about everything the modern world has to offer. He joins Touma and his friends on their quest to fend off the Megiddo and uncover the Sword of Logos' true intentions.

Yuri uses the Sacred Blade SaikouDriver to transform into the sword-esque Kamen Rider Saikou.

Kamen Rider Saikou

仮面ライダー最光

Stunt actor: Arakawa Makoto

Transforms with Wonder Ride Books set into the Sacred Blade SaikouDriver before releasing the blade from the Driver.

Kin No Buki Gin No Buki

金の武器銀の武器

Who is the shining sword? Saikou Chapter One. The blade shining gold and silver. Saikou!
First appearance: Ep 16

Height 121.0cm	Weight 23.2kg
Thurst/Slash Force 50.3t	Top speed About 300,000km (Almost the speed of light)

Kin No Buki Gin No Buki

Set into the SaikouDriver before separating the blade from the Driver to transform.
Saikou's default form, themed after the Gold-tree and Silver-tree.
Appearing in the form of a sword, Saikou is also referred to as the Sword of Light.
Attacks autonomously and can be wielded by other Riders, particularly Kamen Rider Saber.
Spawns the Saikou Shadow to wield him in battle.
Finisher(s) via SaikouDriver:

Saikou Luminescence - Flashes a warm, bright light.

TV Asahi site

Saikou Shadow

最光シャドー

Who is this? Saikou Chapter Two. The shade born from the light. Shadow!
First appearance: Ep 17

Height 195.3cm	Weight 51.3kg
Punch power 9.5t	Kick power 18.8t
Jump power 19.5m	100m Dash 4.4s

Kin No Buki Gin No Buki

A shadow summoned by Saikou to wield him in battle
This shadow can attack the enemy at any angle by shifting to different positions.
The shadow can also extend itself while attacking.

TV Asahi site