Firo Prochainezo

Firo Prochainezo is the closest to a main protagonist from the Baccano! anime and light novels.

Firo is the youngest executive of Manhattan's Martillo Family camorra. He became a complete immortal in November 1930 after accidentally drinking Szilard Quates' immortality elixir at a party celebrating his own promotion.

Appearance
Firo is a boyish young man with brown hair and brown eyes (sometimes depicted as red), and commonly wears a pearl-green suit and matching fedora in the 1930s. He is highly self-conscious about his youthful, "baby-face" appearance. By 2002, he has begun wearing glasses in an attempt to appear older and more mature as befitting his role as contaiuolo.

Personality
For a member of the Camorra, Firo can be a surprisingly friendly, humorous and compassionate person. According to the Gandor brothers, Firo is brash and naive, and in a way someone who fits in with being a Camorrista but is unsuited towards being a criminal. He is not afraid to confront people, nor is he worried about the impression he leaves since he's simply being himself. Anyone who knows anything of the Martillos knows well not to bother Firo, or they will find out just how much trouble they have gotten themselves into.

More often than not Firo is an excessively blunt person, and can be extremely negative towards others to the point of being shockingly cruel. Violence comes easy to him, in short and highly brutal spurts.

He is also somewhat insecure, especially since he is surrounded by exceedingly talented people; he constantly compares himself to Claire Stanfield and the Gandors – sometimes without thinking. Furthermore, he does not have a very high opinion of his own intelligence, constantly calling himself "dumb" and not book-smart in the slightest.

Notably, Firo has some deep-seated issues with femininity, stemming from a childhood incident wherein he was mistaken for a girl and nearly molested. He generally avoids what he perceives to be 'feminine' and has an extremely negative reaction whenever he is called 'girly' or is mistaken for a woman, suggesting that feminine traits carry some stigma for him. This does not mean he dislikes women - on the contrary, he views and treats women with chivalric intentions: he will not hit a woman and considers any man who lays a hand on a woman as 'scum'. In addition, he is incredibly shy when it comes to romance and refrains from taking the initiative even when his feelings are obvious. All of these traits can be traced back to the aforementioned incident, making it one of the most formative events of his childhood.

Firo considers himself neither a 'do-gooder' nor a 'fiend', instead placing himself in the middle. Occasionally he performs good deeds, such as rushing to a fire or donating money, but he is still ruthless and can be vengeful to an extent (as per the above). When Barnes was ungrateful towards Firo after he rescued him from Dallas Genoard, Firo switched the immortality elixir Barnes was carrying with regular alcohol.

Firo does not actively look for trouble himself. However, he does have a tendency to meddle: If something is going on and he happens to be around, more often than not he will either investigate or forcibly involve himself in the situation. Even before becoming immortal, Firo was never afraid to take risks. He did not hesitate to join the Camorra, and he had never been one to back out on anything. His slightly reckless tendencies and his near suicidal loyalty to the Martillos has led him to say that he does not care what happens to him; however, as observed by Ladd Russo, he does fear death and does not consider himself invincible.

Devouring Szilard Quates takes its toll on Firo, who worries that one day he will become as sadistic as the old man. This worry leads him to deliberately act cruel to Isaac and Miria in 1933, after which he is relieved to conclude he took no joy in the act.

Abilities
Firo is formidable with a knife, having been taught knife-fighting by Ronny and Molsa during his years as a Martillo associate. He is also quite capable in unarmed combat, thanks to Yaguruma teaching him wrestling moves. He is also a talented gambler, and is extremely good at catching others at cheating.

In devouring Szilard, Firo gained all the knowledge and memories that Szilard had accumulated over the centuries.

Immortality
As a complete immortal, the only way Firo can 'die' is if another immortal devours him. He can also transmit information to Ennis, since she is his linked homunculus.

Trivia

 * The name Firo means "warrior" in Italian.
 * Firo is fluent in Japanese as he learned the language through Japanese film and manga, as well as through Yaguruma. Because he learned some Japanese through Yaguruma, his Japanese has an old-fashioned flavor to it.
 * Firo is an atheist (a person who disbelieves or lacks belief in the existence of God or gods).