"Aiba Hiroki is a main character in the popular Japanese manga series ""19th End Century Memorandum"". He appears throughout the series as a determined and skilled young man who is passionate about piloting giant robots known as ""mecha"".

Aiba Hiroki is a charismatic character who is often seen as the leader of his team. He is confident, brave and dedicated to his work. Hiroki is also fiercely loyal to his friends and teammates and will do whatever it takes to protect them.

Despite his strong personality and determination, Aiba Hiroki also has a sensitive side. He is shown to be caring and thoughtful towards those around him, especially his girlfriend Yui. He is also quite introspective, especially when it comes to his past and the reason why he became a mecha pilot.

Throughout the series, Aiba Hiroki's mecha piloting skills are put to the test in a variety of dangerous situations. He consistently rises to the challenge, using his intelligence and determination to overcome whatever obstacles come his way.

As the series progresses, Aiba Hiroki's character develops and he becomes more complex. He is forced to confront his own weaknesses and fears, leading to moments of self-doubt and introspection. Despite these challenges, he always manages to come out stronger and more determined than ever.

Overall, Aiba Hiroki is a memorable character in ""19th End Century Memorandum"". His dedication to his work, his loyalty to his friends and team, his strong personality and his willingness to face his fears all make him a fan favorite and a memorable part of the series."