What are Japanese slangs for "tough guy"-" "a hard, aggressive or unyielding person"?

Hello. I'm doing research on and am interested in Japanese youth, street and college slang. What are Japanese slang terms that mean "tough guy"-"a hard, agressive or unyeilding person"? This is the definition I'm looking for, and I'm looking for terms that have a positive connotation. The closest terms I can think of are "tsuee yatsu" and "tufagaru". Please list as many Japanese slang terms for the definition I gave as possible. Thank you. :D