One who is seemingly addicted to the sensation of exhilaration associated with risky behaviors or exciting situations, and who actively seeks such opportunities.
wackadoodle
noun
A crazy, irrational, or eccentric person.
adj
Crazy, irrational, or eccentric.
How often have the words adrenaline junkie and wackadoodle occurred in a corpus of books? (source: Google Ngram Viewer )