Kanji Creation

Kanji Creation (漢字の作成 Kanji no sakusei) is the Quirk used by Joy
Description
This quirk is based around the Japanese lettering system, which is known as Kanji. Joy can take any kanji and like something straight out of a manga, use the word and make it take effect in reality. For example if she chose, 強打 or bang, the object Joy place this on, would produce a bang effect, sending an object flying. Another example is if she chose 火傷 or burn, the object she placed this on, would produce a burning effect, burning whatever object touch this. Some words are too powerful for the user to use, some of these words are "die, rewind, annihilate, etc.." 
Weaknesses
If Joy uses a word, with a healing meaning like "restore, heal, etc..." it will take a bit of energy from her, although it isn't a major amount, so this weakness is usually overlooked.