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- "Absorb Queen: Fusion Jack!"
- ―Transformation announcement[src]
The Jack Form (ジャックフォーム, Jakku Fōmu) is the power-up form of BOARD's Rider Systems which harnesses the power of the Category Jack Fusion Rouse Cards via the Rouse Absorber.
Overview[]
Jack Form is the first upgraded forms of BOARD's Rider System, accessed by inserting the Category Queen card into the Rouse Absorber and scanning the Category Jack card to complete the transformation. In addition to the normal Category Ace, it has the power of two higher-class undead, Category Jack and Queen.
When performing special moves, in addition to these three, it has the power of two to use in combos. It is even possible to display and wield the power of up to 6 Undead. In addition to simply strengthening its combat capabilities, the newly added flight ability greatly increases its mobility.
Users[]
Notes[]

Wolf Undead
- Among the Kamen Riders, Kamen Rider Chalice is completely different from BOARD's Rider System and does not have a dedicated Rouse Absorber. In it's place, Chalice has used a Category Jack, Fusion Wolf, transforming him into the Wolf Undead, which could be considered to be an analogous to Jack Form.