Operating on the premise that Ness only exists in this particular crossover universe, Hermione’s devotion to Loki is in keeping with her character. In her pre-teen years in canon Hermione was less inclined to believe the worst of teachers and other authority figures, such as often sticking up for Snape despite Harry and Ron’s concerns and believing Lockhart’s reputation despite his demonstrated incompetence. She only develops a greater sense of scepticism about authority after the Ministry utterly failed to properly respond to Harry’s warnings about Voldemort at the start of fifth year, culminating in her resolving to make such changes herself as she and her friends were the ones actually able to do anything. By contrast, while Hermione suffered a greater personal loss in this version of events that reinforced how some authority figures can fail her, Loki has personally never let her down when she asks him for help and has always encouraged her thirst for knowledge without dismissing her as just a child, making it natural for Hermione to focus her devotion on to him.
Naturally consent is a very big deal to Gabriel; as an angel, he relies on consent to take a vessel.
Fridge Horror
If Hermione was able to make an appeal to a literal god when she was just seven to get justice for her sister’s death, consider what could have happened to her if she’d been a bit more grief-stricken and decided to try and make a deal with a demon instead? Granted, considering Crowley’s demonstrated standards, he may have a policy against his demons making deals with children if they ever manage to perform the relevant rituals in the first place, but with Hermione’s various achievements in this series and in canon, what if she had been that desperate…?
