Since Lorna's rescue, and the revelation of her pregnancy, the TV drama has carefully unwound her relationship with Marcos with arguments that seem trivial and even predictable. However, they also demonstrate that any romance involving a child of Magneto was always doomed to fail. Both Lorna and Marcos are fully capable, and powerful, in their own right. But Marcos has always been the more romantic of the two, with his almost-suicidal devotion to rescuing her and keeping her on his side. Not unlike how Charles was with Erik. The scene in which Lorna and Marcos combine their powers create the Northern Lights serves as the culmination of their love in the way that "Peace and Serenity" did for the leading men of X-Men: First Class.
It's been stated multiple times on The Gifted that John, Lorna and Marcos were "chosen" by the X-Men before their disappearance, which imbued Marcos with a sense of responsibility to the Mutant Underground. The status of the X-Men has been left murky in the first season, but the effect the team had on mutants like Marcos is clear: He believes in their goal of peace with humankind, even though he's been targeted by them multiple times. Combined with his love for Lorna and her determination to fight back against humanity, Marcos possesses the same optimism espoused by Charles Xavier.
It makes it all the more tragic when Marcos hopelessly pleads with Lorna in the Season 1 finale not to destroy the jet carrying Dr. Roderick Campbell, the creator of the Hounds Program, and his anti-mutant ally Sen. Montez. The lines in the sand are forever drawn in the final minutes as Marcos says, "Our kid has to live in this world!" only to be answered by a coldly determined Lorna: "It's time to make a new world."
With The Gifted renewed for a second season, the Mutant Underground is broken, but not destroyed. Marcos' ability to see the fact that all of them are alive as a positive, and to understand that this struggle takes sacrifice, indicates he'll likely assume more of a direct leadership role. As the Professor said in X-Men Legends II, "the world needs dreamers to give it a soul," and now more than ever, no one has dreams of a better future than Marcos.
Returning for Season 2 in the fall, Fox’s The Gifted stars Stephen Moyer as Reed Strucker, Amy Acker as Caitlin Strucker, Sean Teale as Eclipse/Marcos Diaz, Jamie Chung as Blink/Clarice Fong, Coby Bell as Jace Turner, Emma Dumont as Polaris/Lorna Dane, Blair Redford as Thunderbird/John Proudstar, Natalie Alyn Lind as Lauren Strucker, and Percy Hynes White as Andy Strucker.