|Name in Japanese||相沢 祐一|
|Rōmaji Translation||Aizawa Yūichi|
|Debut (Anime)||Episode 01|
|Voice Actor (Japanese)||Atsushi Kisaichi (2002 anime), Tomokazu Sugita (2006 anime/PSP game), Miwa Yasuda (child)|
|Voice Actor (English)||Chris Patton, Shannon Emerick (child)|
|Height||173 cm (5'8")|
Yuichi Aizawa (相沢 祐一 Aizawa Yūichi ) is the main protagonist of Kanon and a second-year high school student.
He is friendly and outgoing, and though as nice as of a person he is, he has yet to learn the sensitivity of women. He constantly teases the main cast of girls throughout the story which varies in severity depending on the girl. Despite this, he does have a soft side that likens him to an older brother as noted by Shiori Misaka.
He used to visit the city in which the story takes place, but his memories of that time are gone, slowly coming back to him as he interacts with the people he met in the past. As noted by himself, he is afraid of heights and not very fond of sweets. While not aware of it at first, Yuichi slowly begins to take notice in the supernatural events occurring within the city.
During these times of revelation when he will discover something outrageous, he stays strong with the girls he has made close friendships with. Since Yuichi is a normal person, he tries to help them anyway he can and will usually go out of his way in order to protect one or more of these girls.
Yuichi does not have a story behind his character. It was told that due to a family situation, it was decided that Yuichi would live in the Minase house from now on until he decided to move out and live on his own.
When Kanon's story begins, Yuichi meets the five heroines and becomes intrinsically linked with each one of them as the story progresses. Yuichi's main purpose in the story is to be the one where the story revolves around as the protagonist and thus he becomes deeply rooted into each of the five main plot lines associated with each of the heroines.
Yuichi attempts in each arc to stay with the respective girl until their arc has concluded. With Mai, Yuichi helped to fight off the demons, and with Makoto he stayed with her until she ultimately died. With Shiori, he indirectly prevented her from committing suicide, and with Nayuki, he remembers when Nayuki confessed to him 7 years ago with a snow bunny.
He also tried to be there for her when her mother was in the hospital. Lastly, with Ayu, Yuichi tried to help her find her lost item, eventually finding it and repairing it with Nayuki's help.
|Main Characters||Ayu Tsukimiya • Nayuki Minase • Makoto Sawatari • Shiori Misaka • Mai Kawasumi • Yuichi Aizawa|
|Supporting Characters||Akiko Minase • Sayuri Kurata • Kaori Misaka • Mishio Amano • Jun Kitagawa • Kuze • Piro|
|Minor Characters||Kazuya Kurata • Shiori's Classmate • Mr. Ishibashi • Mai's mother • Shiori's mother • Sayuri's father • The Old Man From the Taiyaki Shop • The Lady From Hyakkaya • The Teacher of the Athletics Department • Woman Doctor • The Suspicious Shop's Old Shopkeeper • Stray Dog|