In short, Asbel is a textbook fantasy hero. So textbook, in fact, that he and his kind were written out of the fantasy textbook some years ago as a tired and never-terribly-interesting cliché. Graces does a pretty good job of bringing the cliché to life, though, through a combination of good visual design, good voice-acting and a solid script.
And that's a problem, because this is a cliché that embeds a lot of toxic masculinity, and Graces either doesn't realise this or outright embraces it. Asbel is obsessed with the idea of protecting people; Graces' statement of theme translates as 'Discovering the Strength to Protect'. The idea of protection at hand is fundamentally possessive.
The best illustration of this is in Asbel's relationship to his childhood friend and eventual wife, Cheria. During the childhood section of the game, Cheria is unspecifically frail, easily exhausted and doted on by the people of Lhant. After the seven-year intermission, mysteriously cured, Cheria becomes the party's strongest healer and a powerful caster.
During childhood, Asbel tolerates Cheria more than actually caring about her – in his initial escapade, he drags his brother along to climb a nearby hill, but leaves Cheria behind saying he doesn't want her slowing them down. When they return to town Cheria is upset; Asbel stalls her by handing over a flower he picked idly on the hilltop and pretending he meant it all along as a gift.
In his seven years of training, Asbel never once tries to contact Cheria. When the adult section of the story begins, she comes to find him at the knight academy to tell him his father has died and he's now the Lord of Lhant. She's reticent, clearly sympathetic to Asbel's loss but also unwilling to offer comfort. Asbel is too self-absorbed to understand, but the player will; Cheria has been deeply hurt by Asbel's silence.
Matters reach a head between them a chapter or two later, when Cheria is kidnapped and Asbel rescues her. When she isn't as grateful as he expects – as grateful as she would have been as a child, or as a fairytale damsel – he protests 'You've been treating me like crap ever since I got back here!' This spectacular feat of obliviousness is compounded by every other character present ganging up on Cheria to push her to be nicer to Asbel. Asbel offers only a trite apology, plus excuses that make it unclear whether he really understands his fault.
In other places, Asbel's determination to protect is played for laughs. At one point he gets into an argument with companion Sophie about which one of them will protect the other; they end up agreeing to a race to decide, and Sophie easily wins.
There are comedic examples of how much Asbel wants to fit the rest of the party to his script, too. The game has a rich variety of victory celebrations, several of which it implies have been coordinated and choreographed by Asbel. In the one that features Asbel and the three female party members, they mess up his script and he ends the animation effectively sulking in a corner:
|Asbel, when women don't do what he wants.|
Asbel's ideal of military prowess doesn't come from nowhere. It's bound up in the feudal structure of his society; his father is both master of the household and military commander, and clearly doesn't separate the two roles in his own head. Lord Aston is a harsh, cold presence in the childhood section of the story, and the silence of his absence seven years on is more a continuation than a relief.
It's a cliché to blame toxic masculinity on distant fathers, of course, but the distant father archetype is part and parcel of toxic masculinity, and Graces does a pretty good job of portraying it. In fact, overall, Graces understands toxic masculinity much better than the majority of male-led games. If it deploys clichés, it does so only because toxic masculinity is so inescapable that all its features are sadly familiar.
And herein lies the frustration; ultimately, Asbel gets his fantasy. In the final moments of the story, he gets to step forward and use his martial and magical strength to protect the world. Several much more interesting possibilities that the game flirts with, including some which would require him to accept the protection of others, are squandered.
Compare this, for example, to the engagement with masculine toxicity that Austin C. Howe finds in Final Fantasy VIII. Graces does try to build a contrast between Asbel and his even-more-toxic brother Hubert, but given its endorsement of Asbel, this doesn't actually achieve much. 'This is acceptable because it isn't as bad as that' is a child's excuse for a game that purports to be about growing up.
It is not enough to understand, or to present clear understanding of, dominant cultural constructs. That which does not explicitly challenge will be taken as tacit endorsement. Graces wastes its opportunity, and the good work of its writers, by allowing Asbel his triumph.
 Even the game doesn't think it's kidding anyone as to the nature of the mystery, but it's not relevant here.