It would depend on the context and specific traits of the young man, but some possible characterizations could be ambitious, kind-hearted, determined, or independent.
It would depend on the specific qualities and actions of the young man described. Terms like "hardworking," "ambitious," "kind," or "creative" might be good characterizations, based on his traits and behaviors.
Jeune homme.
"gay man" is the best English term there is.
The Greek for "young man" is kouros. (Kouroi, plural.) Another term is ephebe - this relates to a young man that is on the cusp on manhood.
The man has escaped from prison
Young lady. (referring to a young girl or early teen) It is sometimes used as an endearing term for a little girl. This term should not be used for young woman, only a child. Jovencito (young man)
the man was not a good rider
It can either mean that someone is a coward, or it can be a gay term for a very young gay man.
yes HE WAS THE BEST MAN IN THE WORLD.
That is called indirect characterization. Direct characterization is when the author simply states something like "He was a bitter man."
Conscription.
A young fogey is a term most generally applied to a conservative young man who dresses in a vintage style and who tend towards erudite cultural pursuits.