Fideo Aldena is a prominent character from the Italian national soccer team, Orpheus, and serves as its captain and ace striker. He is widely recognized by his nickname, the White Meteor of Italy, a title that reflects his exceptional speed and brilliant play on the field. Physically, Fideo is a young man of standard height with fair skin, medium-length brown hair, and dark blue eyes. His typical attire includes a grey shirt under a blue short-sleeved jacket, paired with grey trousers and shoes, giving him a polished and approachable appearance.

Fideo's personality is defined by his friendliness, kindness, and an unwavering determination that closely mirrors that of his Japanese counterpart, Endou Mamoru. He is a trustworthy individual who deeply believes in the positive spirit of soccer and places immense trust in his teammates. Fideo never gives up easily and is always eager to help others, demonstrating a strong moral compass that prevents him from taking advantage of those in need. His profound love for the game is rooted in memories of his father, a former soccer player whose own career ended in disappointment. This personal history fuels Fideo's pure passion for soccer, motivating him to play with joy and avoid the pitfalls of obsession that damaged his family.

Within the story, Fideo first appears during the Football Frontier International (FFI) arc, where he quickly forms a bond with Endou Mamoru, whom he uniquely addresses by his first name, Mamoru. Initially acting as the team's captain in the absence of the legendary player Hide Nakata, Fideo faces a major crisis when the manipulative coach Kageyama Reiji, known as Mr. K, systematically injures eight of his teammates. With assistance from members of Inazuma Japan, Fideo leads Orpheus to victory against the saboteur's team, retaining their status as Italy's national representative. Despite being wary of Kageyama, Fideo's curiosity about the coach's past, which he discovers is tragically similar to his own father's, leads him to make a pivotal decision. He chooses to trust Kageyama, a move that allows Orpheus to master a powerful tactical hissatsu called Catenaccio Counter. This act of faith ultimately helps rekindle Kageyama's lost love for soccer. Fideo's key relationships include his strong friendship with Endou Mamoru, his respect for Hide Nakata who eventually entrusts him with full captaincy, and his complex yet transformative alliance with Coach Kageyama.

Fideo undergoes significant development as a leader, evolving from a temporary captain into a truly reliable and respected commander of his team. After a crushing defeat against the powerful team Little Gigant, where his signature shot is stopped with ease, Fideo shows great resilience. Instead of succumbing to despair, he quickly recovers and helps Inazuma Japan train to face the team that defeated him, demonstrating his sportsmanship and desire to see his friend Endou succeed. His abilities are world-class, centered on his phenomenal speed, superb ball control, and tactical intelligence that allows him to command the entire field. His most notable special move is the shooting technique Odin Sword, which has powered-up variations known as Odin Sword Kai (Remastered) and Shin Odin Sword. He also employs other techniques such as Divine Arrow and Hitori One-Two. Fideo's combination of talent, leadership, and character makes him a central figure in the international competition.