Eh, I pondered about this for awhile. I'd say 15-year-olds could probably read and thoroughly understand my comic. If you're going by established manga age regulations, it would be classed as OT (Older Teen) which is usually meant for 16+. While it's got graphic violence, there's not much in the way of sex or nudity. Most nudity is brief and innocent in nature. So I narrowly skipped an adult rating on that one. There is also a main character who uses jumbled profanities in almost every other sentence, but it's done for comedic purposes. Most are just combinations of curse words and random foods, such as "muffin" or "waffle".
However the comic does touch on topics of finding spirituality, mourning loved ones, overcoming trauma, fighting domestic abuse, adoption, subjective morality, abandoning toxic relationships in favor of healthier ones, discovering one's purpose, and of course death. I feel like with such universal themes combined with a healthy balance of both male and female characters, it could potentially be enjoyed by any gender or background so long as readers are old enough to grasp the concepts.
From the get-go though I suppose the violence may be offputting to many readers. I mean, the very first chapter involves a....well, let's say supernatural vigilante of sorts....brutally executing a cultist after he was found abusing children in the name of the cult. Finding justice for victims of domestic and sexual abuse is a reoccurring theme in the comic. I feel like some readers may find it reassuring while others may find it disturbing.
I guess with the supernatural aspects, the blood and gore, and just generally unsettling character designs that look like something straight out of the wrong side of the internet (unnaturally wide smiles and bulging eyes, for example), my comic could be classed in part as horror. And because it does take place in a parallel universe to ours that functions in a much more, I guess "medieval" sense....? with mythical creatures and demons tied in, it could be considered fantasy too. But then again, there's also a lot of light-hearted comedy written in to bring balance to the table. I find that my test audience actually laughs a lot more reading most of my panels, rather than get uncomfortable.
To be honest, I'm not sure about a genre interest demographic. I guess I'll just see when I put out the first few chapters. ^w^"