[@January] That gave me a good laugh, but I forgot to mention, it would be nice if you mentioned how he discovered his abilities. Sorry for that, my bad.

Everything about the ability is fine. I can see Nico as either an excellent support-type character or some sort of duelist. Since your ability is centered around both buffing and debuffing abilities, maybe you could give it a different name? Something like Harmony and Discord. Well, only if you want to.