Shalba Beelzebub/Relationships

Issei Hyoudou
Shalba has an immense hatred on Issei after Issei defeats Shalba in his Juggernaut Drive. Issei also disliked Shalba for his past action to Asia.

Diodora Astaroth
Shalba was using Diodora as a pawn in his plan, killing Diodora afrer Diodora lost to Issei.