Knuckle Bine is listed as being a natural emitter but I am having difficultly reconciling that with his main power. As an emitter, the most difficult class for him to master is the conjuration and then (ignoring specialisation) transmutation.
His ability is to donate (sure you could call it emit) his Nen into another fighter. That Nen will gain interest until it reaches a point where it can force the other fighter into zetsu for 30 days. The difficult thing to reconcil is that this Nen takes the shape of an indestructable mascot and has very unusual properties following very exact rules.
The creation of a physical manifestation is conjuration. This creature appears to be made of Nen which means it wouldn't actually be a physical object (transmutation). These kinds of contracts/rule-following abilities seem to be tied to conjuration as well. I could even buy that he is using manipulation to control the other person's Nen to force Zetsu.
Why is he labelled as an emitter? Is his main ability emission or is he using a different type than his natural? Do other emitters have such unusual Nen properties? (maybe the other ones I'm familiar with are just odd?)