User blog comment:Mizugameza/Which Nen Category?/@comment-5780397-20151224024041

There is a forum for Nen abilities, you might want to go there, we sure would love to have you! Anyway, Hisoka's personality test (which is said to be very unreliable) is kind of vague (I myself fit into all categories with the exception of Specialization), so it's probable you should focus on what you think are the core aspects of your personality and how others see you.

Now, as for your ability: it is worth noting that Specialization does not mean proficiency in all other categories. The only aspect of your ability that can be regarded as Specialization is your Nen-draining fireballs (they resemble a mizture of Emission, Manipulation and possibly Transmutation, but they should not be); your disappearing throwing knives are plain Conjuration, your steel-hard aura genuine Transmutation; "Missili Incendiari" is a combination of Emission and Transmutation.

Your ability is very composite, with its components being unrelated to each other. Furthermore, it uses four Nen types, none of which is Specialization. A possible way around it would be what I did for one of the abilities I created: imagine your Specialization ability's only power is to increase your affinity for all other types (though your affinity for Manipulation and Conjuration must probably be reduced), and in this state you use a second ability, the one you described, like Kurapika during Emperor Time.