August Righteousness is a Delegate, the chief chef of Joyous Guard, and the leader of the Delegate resistance movement Reunion and the Cause faction Jade Kill. As a Delegate, he is a 'shard' or 'aspect' of the Divine Righteousness. Like Righteousness as it appeared in COUNTER/Weight, they are strong-willed and committed to pursuing justice.
In "Wagon Wheel Pt. 3", he speaks to Wine, who is very admiring, and reminds them that Millennium Break undoubtedly has many line cooks and other exploited people like him in its ranks. Despite their misstep, he is perfectly willing to work with Millennium Break for their mutual ends.
The arrival of the Duke upset some of the resistance group's plans due to the increased oversight it caused. However, with the help of the BigStar★ crew, August is able to poison the Duke, making him ill enough to allow the Delegates to take control of Joyous Guard anyway and maintain this control by the start of the next season.