The Testament of Sister New Devil — Characters & Cast

To protect his newly formed family and prevent anyone else from dying because of his inaction.

Beginning as an exiled swordsman haunted by guilt over accidentally disintegrating his village peers, Basara transitions across Seasons 1 and 2 from a reactive, self-sacrificing youth into an assertive leader capable of outmaneuvering high-ranking demon lords and challenging ancient clans.

To live a peaceful life free from assassination while honoring the legacy and sacrifices of her parents.

Starting as an insecure, cornered fugitive overwhelmed by the legacy of her demonic father Wilbert, Mio gradually embraces her heritage. In BURST, she stands upright in demon realm arenas, claiming her voice and agency rather than merely relying on Basara's shield.

Ensuring Mio’s safety and happiness at any personal cost.

Initially playing the comedic, provocative succubus who orchestrates contracts and schemes, Maria reveals profound vulnerability when her sisterly devotion to Mio is tested by extortionists and traitors. She transforms into a steadfast, mature tactical pillar for the team.

Reclaiming her bond with Basara and reconciling honor with personal morality.

Dispatched as an agent of the Hero Clan to surveil and potentially execute Mio, Yuki struggles between ancestral dogma and her unyielding romantic loyalty to Basara. By BURST, she openly defects from the Clan’s rigid orthodoxy, entering into the master-servant pact herself.

Safeguarding his son's future and dismantling corrupt patriarchal control structures across realms.

Known across worlds as the "God-Slaying Hero," Jin maintains the guise of a goofy, absentee father. In reality, his travels subtly shape geopolitical chess boards, clearing space for Basara to forge his own strength without being crippled by the Hero Clan's authoritarian reach.