The Four Kingdoms

Herzen:

King: Ludwig Beilschmidt

Queen: ???

Knight: Gilbert Beilschmidt 

Plot-Vital Members:

Roderich Edelstein

Elizabeta Hedervary

Spades:

King: Arthur Kirkland

Queen: ???

Knight: Alfred F. Jones

Plot-Vital Members:

Matthew Williams 

Maria Clara de la Cruz [OC]

Diamants:

King: Francis Bonnefoy

Queen: ???

Knight: Wang Yao

Plot-Vital Members:

Maybelline de Blanc [unconfirmed]

Kiku Honda

Im Yong Soo

Kaoru Song

Mei Han [unconfirmed]

Treboles:

King: Antonio Carriedo

Queen: ???

Knight: Lovino Vargas

Plot-Vital Members:

Feliciano Vargas

Jasmine Reyes [OC]