Schwarz's Group

Schwarz's men are a group of elite Demons led by Schwarz under the rule of the Demon King, Zeldris.

Demon Realm arc
As soon as the Four Knights of the Apocalypse and their allies, arrived in the Demon Realm, Percival Platoon separated from the group as the previous, started being surrounded by Schwarz's men and were easily handcuffed (with the exception of Gawain) but managed to be freed when Io appeared, revealing that one of the four knights is actually Percival, the savior of the Demon Realm.

Trivia

 * Many members of the group appear to have been based on, or at least to be relatives of the members of the Six Knights of Black, first seen in the non-canon Movie, Seven Deadly Sin: Prisoners of the Sky, before later being confirmed as canon in an extra Chapter of the Manga.
 * The leaders of the two groups, Bellion and Schwarz possess very similar clothes and appearance and even wield extremely similar large swords.
 * An unnamed metalic member possesses a similar armored-like appearance to Pump and by extention, his uncle, Galand and his cousin/brother, Aboru.
 * An unnamed female member possesses a similar headless appearance to Dahaaka and even possessing the same electric abilities generated by their hair.
 * An unnamed short member possesses a similar split appearance to Attolah, both possessing different colored halves, similar noses and possessing no eyes.
 * An unnamed human woman-like member possesses a similar appearance to Galla, both possessing human-like bodies, similar hairstyle and wielding similar whips.
 * An unnamed feline-like member possesses a similar appearance to Derocchio, both possessing an anthro feline-like bodies and very similar faces.
 * Only three members possess no lookalike in the Knights of Black, these two being an unnamed cloud-like member, an unnamed muscled cyclopic member and a grinning sword-like member.