"Is he a brunette or a blonde?"

Translation: Він брюнет чи блондин?

[Carl_Ramrod]

I've reported the English sentence as awkward. To quote from Wikipedia (https://en.wikipedia.org/wiki/Brown_hair)...

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Brunette literally means "little brown-haired girl" or "young brown-haired woman", but, in modern English usage, it has lost the diminutive meaning and usually refers to any brown or black-haired girl or woman, or the associated hair color. [...] Although brunet is the masculine version of the popular diminutive form used to describe a little boy or young man with brown hair, the use of brunet is uncommon in English. One is more likely to say of a man or boy, "He has brown hair" or "He is brown-haired", than to say, "He is a brunette" (or brunet). The term brunette is the feminine form of the French word brunet which is a diminutive form of brun meaning "brown/brown-haired", the feminine of which is brune.
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[MikeParker493189]

I strongly agree with Carl and I would say that in British English one would never call a man/boy a brunette. A brunette is always a woman/girl with brown hair. For a man/boy just say that he has brown hair. I would also suggest avoiding calling a man/boy a blonde or a redhead, although these are less definitively wrong and they might sometimes be acceptable in the right company. (OK, perhaps this is sexism that we have not broken free of yet.)

[Michael27b]

I think in American English referring to a guy as a brunette would be awkward or risk sounding feminine.

[obado]

Same for blonde - feminine, blond - masculine