Fluss is a light-skinned man of average height. His face is hidden beneath the hood of his robe.
Fluss is shown to be ruthless in battle.
One day, Heath Grice, Fluss, and two other Eye of the Midnight Sun members are sent on a mission to search Sosshi village for a magic stone. Heath and his subordinates gather all the villagers to the center of the village to execute all of them, but he fails to do so when Magna Swing interferes by neutralizing his attack with a Fire Magic spell. Heath's subordinates discuss the Black Bulls' sudden appearance.
Magna steps out of the shield and pitches multiple fireballs at the four mages. The mages are caught by surprise when Asta appears behind them and reflects back four fireballs that missed. The attack knocks all four of them down and sets their clothes on fire. Magna uses the fire to bind the mages, but Fluss extinguishes the spell and escapes with his Water Magic.
- Compound Magic: Fluss combines his Water Magic with others' magic to create more powerful spells.
- Fluss is German for "river."
|Fana (elf) • Rhya • Vetto|
|Abari • Catherine • Fana • Fluss • George • Heath Grice • Rades Spirito • Sally • Shidan • Toike • Valtos • Zarick • Zuta|
|Gravito Rock Zone|
|Holy Fist of Love • Sea Dragon's Waterball • Holy Water Assassination Bullet • Death Dealing Sea Serpent • Sea God's Hammer • Sea Dragon's Roar • Climbing Coelacanth • Aqua Javelin • Tainted Culvert Wyrm • Surging Waves • Cascade Destroyer • Point-Blank Sea Dragon's Roar • Sea Serpent's Bellow|
|Sea Dragon's Nest • Sea Dragon's Cradle • Sea God's Shield • Valkyrie Dress|
|Current of the Fortune River • Sea Serpent Twine • Qualle Operation • Aqua Curtain • Ludic Sanctuary|
|Adrian • Fluss • Francis • Lily Aquaria • Owen • Noelle Silva • Risacca Ondell • Selena • Solid Silva|
|Lolopechka • Undine|
|Cage of Infinite Hail||Heath Grice • Fluss|
|Thunder Arrow||Luck Voltia • Klaus Lunettes • Puli Angel|
+ Sandstone + Wing
|Elemental Quintet||Rhya • Rossa|
|Mirrors Slash • Mirrors Meteorite||Asta • Gauche Adlai|
|Flame-Lightning Explosive Cannon||Magna Swing • Luck Voltia|
|Sea God Slash • Sea God's Descent||Kiato • Kahono|
|Le Château de Verre|
|Storm of Light Imperial Swords of Conviction||Patolli • Drowa|
|Reflect Iris||Drowa • Eclat|
|Demon-Dweller Sword: Protecting Light||Licht • Lemiel Silvamillion Clover|
|Demon-Dweller Sword: Spirit Light Tree||Licht • William Vangeance|