My picks are Jean, Ororo, and Betsy/Kwannon (both would be featured) series or miniseries. I think it's clear how epic series/miniseries for Ororo and Betsy/Kwannon would be, so I'll share my vision for Jean's series/miniseries.
Jean Grey - This series or miniseries would be faithful to Jean’s origins, opening with her best friend Annie Richardson’s death, which acted as a catalyst for the awakening of her telepathic powers and put her in a catatonic state that lasted three years. It would also cover Xavier's first meetings with and psychological rehabilitation of Jean; the emergence of her telekinetic abilities; and her telepathic discovery of Scott, who, at the time, lived in the orphanage, which would foreshadow the formation of the first genesis of X-Men.
The aforementioned phases of Jean's life would be told in various lengthy and immersive flashbacks, while the main story would focus on Xavier's tutelage of Jean--his first student--and her coming to terms with being a mutant and randomly helping people. Additionally, as mentor and protege, Xavier and Jean would attempt to control and discover the extent of Jean's abilities, which would eventually lead to the events that prompt Xavier to suppress her telepathic abilities, before going off to recruit the remainder of the original five X-Men.
All of the above would unfold during the first season of the series or as a standalone miniseries.