Any person or character who displays quixotism.
A famous 1605–1615 Spanish novel by Miguel de Cervantes (1547–1616), whose full title is El ingenioso hidalgo don Quijote de la Mancha (The Ingenious Gentleman Don Quixote of La Mancha).
The protagonist of this novel.
A person with romantic character (a character like those of the knights in a mythic romance).
A person who is behaving romantically (in a manner befitting someone who feels an idealized form of love).
Pertaining to an idealised form of love (originally, as might be felt by the heroes of a romance); conducive to romance; loving, affectionate.
Experiencing romantic attraction.
Having the qualities of romance (in the sense of something appealing deeply to the imagination); invoking on a powerfully sentimental idea of life; evocative, atmospheric.
Fantastic, unrealistic (of an idea etc.); fanciful, sentimental, impractical (of a person).
Of a work of literature, a writer etc.: being like or having the characteristics of a romance, or poetic tale of a mythic or quasi-historical time; fantastic.