The Full Form of GAG is‍ Generic anime girl.

A lot of characters are generic in different ways: they’re overpowered, they’re a nice guy who helps everyone and everyone likes them, they’re “too cool to care”, and they’re completely horrified and embarrassed by the idea of involving themselves and a member of the opposite sex in any kind of situation that’s even remotely sexual.

On their own, those characteristics aren’t necessarily detractors from a character. Overpowered characters can be believable if we can see that they’re doing something different to everyone else, or it’s played purely for comedic effect. “Too cool to care” type characters are often done quite well in shows where that attitude slowly changes over time or the character is punished for not taking a more active role, and being averse to the idea of sex and sexuality is fine if it’s explained why the character is that way, or if it’s just a facet of that anime’s world.

But Ayato Amagiri embodies so many of these character traits, many of which are totally contradictory, that what we have is a character that can’t even be imagined to be salvageable.

The idea of protagonists in shows like The Asterisk War is as a placeholder for the audience, so main characters in this type of show usually are quite bland. However, most of them do begin with some kind of aspect to them that, due to the interference of other characters and events happening in the world, they are forced to change, ultimately making them a more likeable, developed and interesting character.