I was just thinking about Nobu's hatsu, or lack of one considering he's an enhancer.
We all joke about how 4 meter en, but something doesn't add up. He says that's his striking ranging, but the sword obviously isn't 4 meters long.
Could he be a Gon-like enhancer who dips into the adjacent categories? Maybe Nobu also produces a transmutation blade, which extends from the tip of his real sword out to 4 meters. This would allow him to trick people into thinking they're at a safe distance when they're actually vulnerable, especially if he applies In to the extended blade.