Friedrich is a dragon companion summoned through Caro Ru Lushe's tribal Dragon Summon magic. Typically appearing alongside another dragon named Voltaire, he functions as Caro's primary mount and combat partner, maintaining a consistent presence across series installments.

In *StrikerS*, Friedrich accompanies Caro during her Frontier Nature Conservation Corps duties on Supools. He engages in Riot Force 6 operations, delivering aerial mobility and firepower against Gadget Drones and during the JS Incident. His combat repertoire includes flight, physical strikes, and breath-based projectiles like Blast Flare. At the JS Incident's climax, he aids in breaching the Saint's Cradle to rescue Vivio. Supplementary manga (*StrikerS THE COMICS*) shows his summoning during the Coastal Airport 8 fire, where he supports evacuation efforts.

After *StrikerS*, Friedrich continues conservation work with Caro and Erio Mondial on Supools. He appears non-combatantly in *ViVid* during family gatherings involving Fate Testarossa, Nanoha Takamachi, and Vivio.

During *Force*, Friedrich evolves into an advanced form named Voltaire, aligning with Caro's enhanced capabilities. This iteration integrates S2 Shields—defensive gear countering Eclipse Virus threats—and exhibits heightened durability. As Voltaire, he coordinates with Caro's tactical role in Special Duty Section 6, notably during convoy protection missions against the Grendel family.

Friedrich's bond with Caro underscores her progression from a summoner fearful of her powers to a confident mage. His summoning and control signify her mastery over early insecurities.