u/TheHellRay

The oni's horns don't really seem to do anything other than serve as physical markers for who isn't human or a Momotaro. That would be fine, but as the story continues, the ideas pile up on how much of a missed opportunity they are. Like the tracking oni could really use them with their related abilities, using them to increase the potency of their tracking abilities like a satellite or relay with other oni.

Would be cool if Onis actually unleashed their horns later in battle it signifies them using a new or different aspect of their current abilities, getting readers hyped for a change in the battle of mixing abilities without outright telling us. I think of comparisons like in Naruto with Orochimaru's curse mark amps with the spreading tattoos signifying a amped boost in power, then the next stage, the unique physical transformation amp like Sasuke Uchiha's hand wings that gifted him actual flight. Still bummed we never got to see giant jutsu performed with those big demon hand wings.

Or maybe the Kakuja mutation from Tokyo Ghoul that adds a new aspect to some ghoul's established powers as well as menacing lore implication. Imagine a change in Oni's horns being a visual identifier that they committed some egregious act like >!cannibalism in Tokyo Ghoul's case!< and they gained power from it. Would be a different story, trusting a oni with distinct signs that they eat other Oni or even momotaro at some point in their life.

A nice risk factor to the proposed combat capability could be if they used their different abilities requiring activating their horns, their horns stay involuntarily active longer so if they escape and someone sees them, that would confirm their oni identity to someone if spotted.

Right now, Oni horns feel like they're only cosmetics with a death warrant. I actually forgot that Onis have unique horn shapes with how little they seem to matter, functionally. They look so cool too...

Would you change anything?