Characters

Kazuma Kenzaki/Kamen Rider Blade (剣崎 一真／仮面ライダー剣, Kenzaki Kazuma/Kamen Raidā Bureido?)
Chosen by the B.O.A.R.D. organization, Kenzaki uses the sealed Category Ace of Spades (Change Beetle) to become Blade. He has a good heart and believes in fighting to protect humanity.
Sakuya Tachibana/Kamen Rider Garren (橘　朔也／仮面ライダーギャレン, Tachibana Sakuya/Kamen Raidā Gyaren?)
Chosen by the B.O.A.R.D. organization, 25-year-old Tachibana uses the sealed Category Ace of Diamonds (Change Stag) to become Garren.
Hajime Aikawa/Kamen Rider Chalice (相川　始／仮面ライダーカリス, Aikawa Hajime/Kamen Raidā Karisu?)
Though he looks 23 years old, Hajime is actually the Undead known as Joker using the sealed Category Ace of Hearts (Change Mantis) to become Chalice. In order to maintain human form, he uses the Category 2 of Hearts (Spirit Human) in order to take human form.
Mutsuki Kamijō/Kamen Rider Leangle (上城　睦月／仮面ライダーレンゲル, Kamijō Mutsuki/Kamen Raidā Rengeru?)
As a weak-willed 17-year-old high-school kid, Mutsuki was chosen by the Category Ace of Clubs (Spider Undead) to become Leangle, though reluctantly at first. He gains a thirst for power as the Category Ace takes over his mind.