Help with French slang

I'm not a native speaker but Frensh is my second foreing language, so I can help u !

I'm not a native speaker but Frensh is my second foreing language, so I can help u !

I'm a French speaker, but the problem is I'm not an English speaker :p so I'm not sure I understand all the expressions of your list

tough guy => mec dur (This one is not a real expression, but I can't see any equivalent, sorry )
tomboy, besides gars manque => garçon manqué (gars manque is not correct)
tough girl => fille/nana dure
tough woman => meuf cool
cool guy => mec cool
cool girl => fille/nana cool
powerfully-built male => balèze (ex:Il est balèze= He's powerfully built)
powerfully-built female => balèze (ex/ Elle est balèze = She's powerfully built)
punk=>... punk (I think? Although I'm not sure you use this word the way we do...)
gangster => Gangster / Truand / Racaille / etc. (depends on which slang you want)
ruffian => ?
guy prone to fighting => Tête brûlée / chaud (the expressions "faire son chaud" (as well as "chercher la bagarre / chercher la cogne) mean to search for a fight)
woman prone to fighting => Tête brûlée / chaude (same remarks)
girl prone to fighting => Idem
delinquent boy => racaille (or 'caille or caillera, according to the "level" of slang you want)
delinquent girl => racaille (same variants)

Those are the words that first came to me, but French slang is quite varried, with a lot of levels, so if you want a particular level of slang, just say it so I can be more precise.

Oh OK I didn't know the word "Ruffian"
"un bagarreur" can be a man prone to fighting.
Un "gros dur", "dur à cuire", "balèze", "gros balèze", or "une armoire à glace" can design a strong guy.
But all these expressions are still if not polite, at least not harsh. I can't think of any "real" slang equivalent for the words of your list.
If you want street and college slang, maybe you should try with other subjects. For example, "boring" is "relou" in verlan (a french form of slang), woman is "meuf", or "gonzesse", etc.

No, "balèze" can be used for men, women and objects.
Sometimes we can call a woman who is "as strong as a man" a "bonhomme" (which means "man", but in a familiar way). It's a slang use of the word in a specific context, such as "Cette meuf, c'est un vrai bonhomme!" (=>"This woman is built like/acts like a man!"). But the strengh is also linked to the idea of masculinity.

I'm a French speaker, but the problem is I'm not an English speaker :p so I'm not sure I understand all the expressions of your list

tough guy => mec dur (This one is not a real expression, but I can't see any equivalent, sorry )
tomboy, besides gars manque => garçon manqué (gars manque is not correct)tough girl => fille/nana dure
tough woman => meuf cool
cool guy => mec cool
cool girl => fille/nana cool
powerfully-built male => balèze (ex:Il est balèze= He's powerfully built)
powerfully-built female => balèze (ex/ Elle est balèze = She's powerfully built)
punk=>... punk (I think? Although I'm not sure you use this word the way we do...)
gangster => Gangster / Truand / Racaille / etc. (depends on which slang you want)
ruffian => ?
guy prone to fighting => Tête brûlée / chaud (the expressions "faire son chaud" (as well as "chercher la bagarre / chercher la cogne) mean to search for a fight)
woman prone to fighting => Tête brûlée / chaude (same remarks)
girl prone to fighting => Idem
delinquent boy => racaille (or 'caille or caillera, according to the "level" of slang you want)
delinquent girl => racaille (same variants)

Those are the words that first came to me, but French slang is quite varried, with a lot of levels, so if you want a particular level of slang, just say it so I can be more precise.

No. Never. The expression is "Garçon manqué", I'm pretty sure of it. Maybe in canadian french,but I'm not sure. In France I never heard "gars manqué".
"Bonhomme" is not a vulgar term. "C'est un bonhomme!" means "she's a man!", or something like that. It's not vulgar at all.
When two brothers are in a struggle, we call them "frères ennemis" (I think it can work for sisters too ("soeurs ennemies")), but it's more an expression than real "slang".

As I said: "frères ennemis" (fighting brothers) and "soeurs ennemies" (fighting sisters), but it's not really what I'd call "slang" (although I'm not a specialist of the subject...).
Litterally, "fighting brothers" translates as "frères qui se battent" in French, but the coined expression is "frères ennemis".

Ow! Sorry!
Well... I think it's "frère ennemi" (without the 2 "s"). "Un frère ennemi" ("a fighting brother"), and "une soeur ennemie" ("a fighting sister").