TV-Series
Description
Sylvester holds the position of seventh archduke of Ehrenfest, bearing the title Aub Ehrenfest and governing the duchy. His appearance includes long, blue-tinged purple hair secured by a silver cord or clasp, deep green eyes, strong eyebrows, and a muscular build. He stands slightly shorter than his half-brother Ferdinand, resembling contemporaries like Benno in apparent age.

Born to the sixth archduke Adelbert and Veronica, Sylvester endured a contentious succession battle against his elder sister Georgine, groomed for leadership. His superior mana capacity and male gender secured his eventual selection as archduke, intensifying Georgine’s resentment. This conflict prompted her marriage into Ahrensbach as a third wife, a move intended for Sylvester’s protection that instead deepened their rivalry. He later married Florencia, younger sister of Frenbeltag’s archduke, weakening his political footing during negotiations with their siblings. Early in his reign, he defied his mother by rejecting a second wife.

Sylvester formed a protective bond with Ferdinand after the latter’s baptism, despite their six-year age gap. To shield Ferdinand from Veronica’s abuse, he orchestrated Ferdinand’s entry into the temple, removing him from succession and noble politics. This decision unintentionally burdened Ferdinand with excessive work, as Sylvester habitually delegated his own responsibilities without recognizing the strain.

Personality-wise, Sylvester displays impulsiveness and a teasing demeanor, often seeming younger than his years. He balances childlike curiosity with sudden gravity during crises. Openly averse to paperwork, he embraces innovation and novel experiences, exploring commoner areas like the lower city forests and orphanages. Initially unfamiliar with commoner practices—such as basic river handwashing—he adapts through direct interactions with figures like Benno and orphans, permitting them to use the informal address "Brother Syl" for ease. Deep familial loyalty occasionally leads to excessive leniency, particularly toward his children, contributing to conflicts like Wilfried’s entitled behavior.

Key story involvements start with his undercover role as a blue priest during Myne’s Spring Prayer, where he assesses her potential and gifts her a protective magic necklace. He engineers a pivotal incident involving Count Bindewald and the corrupt High Bishop, revealing his identity as archduke to force Myne’s adoption and ensure her safety. This maneuver also enables the arrest of his uncle and mother Veronica, neutralizing internal threats. Later, he announces Rozemyne’s adoption and appointment as acting High Bishop during her baptism. As archduke, he oversees ceremonies like the Starbind, reciting tales from memory and discreetly guiding Rozemyne to amplify her blessings for political impact.

Over time, Sylvester evolves from delegating tasks to Ferdinand and Rozemyne into greater reliability, particularly after Wilfried assists him. He strategically accepts Brunhilde’s engagement proposal, leveraging her Leisegang faction ties to stabilize political divisions, though Florencia’s pregnancy delays the marriage. After Florencia bears their daughter Henriette, Brunhilde formally becomes his second wife.

Magically, Sylvester commands a highbeast shaped like a three-headed lion. Initially possessing affinities for all elements except life, he later gains divine protections from 21 gods—including Dauerleben and Schlaftraum—via ritual, becoming omni-elemental. This enhances his capabilities, notably improving Entwickeln magic during Groschel’s reconstruction. Additional skills include proficient non-magical hunting, evidenced by deer and bird kills, and occasional gewinnen victories against Ferdinand.

Trivia notes include a childhood pet shumil named Blau ("blue" in German), which often collapsed from exhaustion and eventually fled. He regularly wears a silver hairband and once provoked Ferdinand to heighten the mana barrier on his hidden room after tampering with belongings. His relationships extend to retainers like Rihyarda, his former head attendant who rejoins his service after supporting Rozemyne.