Angela was first created by Neil Gaiman for Todd McFarlanes creator-owned Spawn series in the early 90s. After the character made subsequent appearances without Gaimans involvement, a legal battle between Gaiman and McFarlane ensued, with Gaiman eventually winning full rights to the character. In 2013, Marvel acquired the rights to Angela and immediately used her as part of the finale to the Age of Ultron mini-series, explaining her debut in the Marvel Universe as being a byproduct of the galaxys timelines ripping apart. From there, her first full appearance occurred in the Brian Michael Bendis run on Guardians. So after going through all that trouble bringing Angela into the universe, how can Marvel not throw her into a Guardians of the Galaxy movie somehow?