The Dark Irregulars are a clan consisting of classic monsters like vampires, ghosts, demons, and mutated abominations, who are shunned by other clans due to their practice of dark magic and twisted science. The Dark Irregulars main focus in battle is heavy soul charging and gaining power based on how big the soul is. The downside is they have a terrible early game and their heavy soul charging makes them vulnerable to decking out. 

Notable users

Tetsu Shinjou in all appearances

Jun Mutsuki in season 1

Eru Nakagami in season 3

Ichiro Yamada in the G series 

Satoru Enishi in the G series