Of all the Titan-Forged Keepers entrusted with the progression of Azeroth following the war with the Black Empire, Mimiron may be the most clever and inventive.
One of the things I really like about the Broken Shore is that it introduced new followers.
When last we looked at the Titan-Forged, one of the Keepers had gone mad.
When last we talked about the Titan-Forged, they'd defeated the Old Gods and imprisoned them deep within Azeroth itself, then began their process of shaping the world in order to preserve its World-Soul and shepherd it to awakening as potentially the greatest of the Titans.
In the distant past, Aggramar the Avenger discovered a World-Soul by sensing its powerful dreams across the vast distances of the Great Dark.