|This article is about a/an Rider in Kamen Rider Saber: 100 Years After.|
- "Part of me died that day, but part of me broke free"
- ―Isaac's final monologue
Isaac Kalder is a main character in Kamen Rider Saber: 100 Years After. He is the son of Joseph Kalder and the current holder of the Ankokuken Kurayami, letting him become the fifth known Kamen Rider Calibur. 100 years after the battle with Storious, the New Sword of Logos faces the Megid Remnant when Arachnid starts collecting the Alter Ride Books. Isaac, due to pressure from Joseph and ridicule from teammates, defects from the New Sword of Logos and joins Arachnid and the Megid Remnant.
- Joseph Kalder/Kamen Rider Solomon: TBA
- Jack Kamiyama/Kamen Rider Saber: TBA
- Michael Archer/Kamen Rider Blades: TBA
- Courtney Crimsen/Kamen Rider Espada: TBA
- Rebekah/Kamen Rider Kenzan: TBA
- Sora Ogami/Kamen Rider Buster: TBA
- Sophia: TBA
- Jasper: Issac's Girlfriend
- Abraham/Arachnid/Kamen Rider Arachnid: TBA
Behind the scenes
- While having the same name and Universe, Isaac Kalder is NOT related to Isaac, the previous Master Logos.