Arc-Dash, originally designated Arcbeetle-Dash, is a KBT-type Medarot modeled after a hercules beetle, engineered to transform into a vehicular form via Medachange. Developed as a prototype by the Medarot Corporation, its initial heavy frame struggled with mobility during testing. Former Death Medarot user Ginkai acquired the unit after a tournament victory, integrating the Kabuto Medal from his abandoned Medarot Bayonet into its systems. This fusion forged a partnership anchored in mutual respect and Ginkai’s renewed commitment to honor.

Ginkai had once discarded Bayonet in frustration, burying its Medal before renouncing emotionless combat philosophies. Retrieving the Medal symbolized his rejection of past ruthlessness, allowing Arc-Dash to inherit Bayonet’s legacy while embodying Ginkai’s reformed principles. The Medarot’s personality echoes Metabee’s stubborn loyalty, often prioritizing instinct over commands to shield allies—particularly Peppercat, whom it defends relentlessly.

Arc-Dash’s rare Medal grants access to the devastating Medaforce, amplifying its combat prowess. Its head unit, Appendix, fires a unique laser attack distinct from Arcbeetle’s Prominence beam, trading raw power for tactical versatility. During decisive battles, Arc-Dash merges with Tyrrellbeetle to become Masterbeetle, a fusion capable of overpowering adversaries like Redrun but outmatched by Gryphon. These alliances prove critical in confrontations against the Death Medarot Company.

The Medarot’s evolution mirrors Ginkai’s journey from ruthless competitor to honorable Medarotter. Once a discarded prototype, Arc-Dash emerges as a symbol of redemption, emphasizing emotional bonds over cold efficiency. Its pivotal actions—rescuing Blackbeetle, defying Kokuryuu’s ideology—catalyze the collapse of the Death Medarot hierarchy, cementing its role as both weapon and ally.