I'm assuming given the movie's red coat that you mean Enjolras. (Because when you say that one revolutionary that I don't think I need to name, my brain goes to Bahorel. And then maybe to Combeferre. Oooh and then Courfeyrac, because every answer seems like the obvious answer.)
Hugo devoted a good amount of Enjolras' introduction to his physical description, actually:
Enjolras was a charming young man, who was capable of being terrible. He was angelically handsome. He was a savage Antinous. One would have said, to see the pensive thoughtfulness of his glance, that he had already, in some previous state of existence, traversed the revolutionary apocalypse. He possessed the tradition of it as though he had been a witness. He was acquainted with all the minute details of the great affair. A pontifical and warlike nature, a singular thing in a youth. He was an officiating priest and a man of war; from the immediate point of view, a soldier of the democracy; above the contemporary movement, the priest of the ideal. His eyes were deep, his lids a little red, his lower lip was thick and easily became disdainful, his brow was lofty. A great deal of brow in a face is like a great deal of horizon in a view. Like certain young men at the beginning of this century and the end of the last, who became illustrious at an early age, he was endowed with excessive youth, and was as rosy as a young girl, although subject to hours of pallor. Already a man, he still seemed a child. His two and twenty years appeared to be but seventeen; he was serious, it did not seem as though he were aware there was on earth a thing called woman. He had but one passion--the right; but one thought--to overthrow the obstacle. On Mount Aventine, he would have been Gracchus; in the Convention, he would have been Saint-Just. He hardly saw the roses, he ignored spring, he did not hear the carolling of the birds; the bare throat of Evadne would have moved him no more than it would have moved Aristogeiton; he, like Harmodius, thought flowers good for nothing except to conceal the sword. He was severe in his enjoyments. He chastely dropped his eyes before everything which was not the Republic. He was the marble lover of liberty. His speech was harshly inspired, and had the thrill of a hymn. He was subject to unexpected outbursts of soul. Woe to the love-affair which should have risked itself beside him! If any grisette of the Place Cambrai or the Rue Saint-Jean-de-Beauvais, seeing that face of a youth escaped from college, that page's mien, those long, golden lashes, those blue eyes, that hair billowing in the wind, those rosy cheeks, those fresh lips, those exquisite teeth, had conceived an appetite for that complete aurora, and had tried her beauty on Enjolras, an astounding and terrible glance would have promptly shown her the abyss, and would have taught her not to confound the mighty cherub of Ezekiel with the gallant Cherubino of Beaumarchais.
But really, tie a tricolor sash around your waist and call it a day if you're not trying to emulate any particular incarnation. Everything else you've suggested sounds like you're already on the right track.