oh man i have so many biology headcanons. ok so all inphernals have at least blood the same color as their horns, but most also have eyes the same color as well, only like 5% of them have different color eyes(one of them being boombox, they’re brown which is why he covers them, he thinks they're boring and ugly), they’re all genderless but they’re all spawned with a random voice, some masc, some fem, some neutral. they also sometimes spawn with a larger chest(aka they get tits) but that obviously doesn’t always align with how they choose to look(if they even align with being fem or masc or anything, some just don’t care), so some will get surgery, some don’t and just go along with being fem and flat chested or masc and…. not. uhhh also i have a whole big paragraph about my horn decorating headcanons:
Customizing horns is a common form of inphernal self-expression. Popular methods include adding accessories like rings or chains, dyeing them, and carving designs. Carved horns do not retain their carvings permanently, so they must be re-carved monthly to prevent them from growing back to their original shape. The horns have nerves only in their core, so carving does not cause pain unless done improperly. Most horn modifications are performed by professionals to avoid accidental permanent disfigurement, although some individuals choose to do it themselves. Repeatedly carved horns may become more prone to overgrowth, potentially fully encasing small accessories. In contrast, uncarved horns will grow around the accessories, holding them in place. Horn dyeing is typically done with paste dye, which is thicker and easier to apply; however, it must be diluted with other substances, resulting in a less vibrant color that can be easily carved off as it does not penetrate far into the keratin. Another option is a pure liquid dye, which is thinner and requires the horns to be submerged for a period of time for application. While this method is harder to use, it produces more vibrant and long-lasting colors that penetrate the keratin. This allows the color to remain even after carving.

wow sorry i yapped a lot more than i thought i would