Transmutation

They  are whimsical and prone to deceit. Transmutation users have unique attitudes, and many are regarded as weirdos or tricksters. Often they put forth a facade while hiding the truer aspects of their personalities. Even when they don't hide their personalities they rarely reveal their true intentions. Many Transmuters rely on techniques that give unique and unpredictable properties to their Nen that reflects their personalities.

Users:

Killua (Lightning Cloak of Godspeed)

Hisoka (Bungie Gum "Bungee Gum has the properties of both rubber and gum.")