The daughter of Merlyn, Roma took over his duties after he turned evil and lost to Captain Britain. As the Omniversal Guardian, she supervised the Captain Britain Corps. Roma's main involvements in the fate of Earth-616 include resurrecting the X-Men (including Captain Britain's twin sister Psylocke) after they died in battle fighting the Adversary during the Fall of Mutants. Before sending them to Australia, Roma gave Psylocke the Siege Perilous.

A few years later, Roma would also influence the Braddocks' lives by first asking Brian to rule the Overworld with his wife Meggan, then by taking away Psylocke while she was delivering the killing blow to the Shadow King under her twin's eyes. This latest action was in fact intended to add Betsy Braddock to the Exiles team.

Eventually, the Braddock twins reunited in the wake of [[X-Men: Die By The Sword:vol:19237]]. This crossover between the Exiles and New Excalibur saw these teams join forces to help Roma and Saturnyne fend off the attacks of Merlyn, who set his mind on reclaiming his throne, and Mad Jim Jaspers. The fight would reach its climax with Roma being killed by a Fury-infected Jaspers.