Romonus through his status as a God has not just a set of mutated Evil Pieces he named his Demonic Pieces, but a set of Demonic Saints which do not exist in his verse.
Demonic Pieces
Queen Piece(1)-
Knights(2)-Tobio Ikuse and Silvana Berith
Bishops(2)-Akeno Himejima and Valerie Tepes
Rooks(2)-Shirone and Miria Amduscius
Pawns(8)-Itsuki Hyoudou(4 Pawns), Natsume Minegawa(1), Kouki Samejima(1)
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Demonic Saints
Queen-Venelana Bael
Jack-Vespera Carmial Bael
Ten-Serafall
Nine-Roygun
Eight-Latia Astaroth
Seven-Rias Gremory
Six-Seekvaira Agares
Five-Kuroka
Four-Walburga
Three-
Two-
Ace-Viviana Lucifer
Joker-