A person who raises hell or causes trouble; someone wild or reckless.
From 'hell' (Old English 'hel') plus '-er' suffix. A 'heller' is someone who engages in hell-raising behavior; used informally, particularly in dialectal English.
The word 'heller' is a great example of how personality types get immortalized in language—we have a word specifically for a person who causes chaos, which means different cultures throughout history have always had to describe the same troublemaking people.
Complete word intelligence in one call. Free tier — 50 lookups/day.