TV-Series
Description
Dr. Crossword Arno is a character who appears in Inazuma Eleven GO 2: Chrono Stone. He is a doctor and a distinguished expert in the fields of space-time physics and time travel, credited as the individual who discovered the method for traveling through wormholes. Physically, he is depicted as a senior male with cream-colored or blonde hair that is thinning or balding in the middle, complemented by thick eyebrows and a mustache. He wears a device over his left eye and is typically dressed in a white and blue lab coat.

In terms of personality, Dr. Arno is portrayed as a brilliant but eccentric scientist whose explanations about complex theories like parallel worlds are often difficult for others to grasp; he tends to speak in technical jargon that goes over the heads of most of his listeners. He has a habit of appearing and disappearing unexpectedly, often arriving at critical moments to provide information or assistance before departing just as suddenly. Despite his odd demeanor, he is fundamentally an ally to the main characters, using his intellect and technology to aid their mission.

Dr. Crossword Arno serves as a crucial mentor and support figure throughout the Chrono Stone narrative. He is the creator or primary operator of the Inazuma TM Caravan, the primary time machine vehicle used by the Raimon team to travel through history. His motivation throughout the story is twofold: to assist the team in their mission to revive soccer and to complete his personal project of developing an "antidote" to free Endou Daisuke, a legendary figure who had been sealed within a Chrono Stone. He is often the one who explains the mechanics of time travel and the specific challenges of each era, such as the differences between time travel and traveling to the world of fairy tales.

His key relationships are primarily with the members of the Raimon soccer team. He shares a particular connection with Akane Yamana, as she is the only member who initially understands his scientific explanations due to her interest in science fiction, and she is thrilled to meet a real scientist from the future. He also works closely with Fei Rune, being one of the characters who understands Fei's origins and the threat posed by SARU from the beginning. In fact, he later reveals that he was fully aware of SARU’s true identity and plans from the start, choosing to follow along with the scheme to allow Fei to come to his own realizations about what needed to be done.

Throughout the story, Dr. Arno’s role develops from a simple explainer of science to a more active participant. He aids the team directly in several instances, such as deploying a flock of dinosaurs to rescue them from the threat of brainwashing during the Cretaceous period. He shows a compassionate and philosophical side when Torb decides to stay with the dinosaurs instead of reuniting with his human parents, stating that it is a valid way to live and that he will explain the situation to the parents. In the final arc, his scientific work culminates in success, as he finally manages to use his machine to successfully free Endou Daisuke from the Chrono Stone.

Regarding abilities, Dr. Arno is not a soccer player; his talents are purely academic and technological. His most notable abilities include his profound knowledge of space-time, his engineering of time-traveling devices like the Inazuma TM Caravan, and his scientific skill in creating a method to reverse the effects of a Chrono Stone. In combat or soccer situations, he is not a fighter, but his inventions and information are vital to the team's progress. In the video games, he is classified as a forward with the Wind element, although this is not a focus of his role in the anime's story.