Naoyuki is Tomoya's father. Tomoya's mother Atsuko Okazaki died when Tomoya was young, thus leaving only himself to raise Tomoya. After the accident, Naoyuki turns to alcohol and smoking, and held frequent fights with his son. One day while arguing with his son on trivial things, he slammed Tomoya against the wall, dislocating Tomoya's right shoulder. Immediately after that, Tomoya refused to come out of his room, and by the time he finally went to the hospital, it was declared to be untreatable. Ever since then, his father has treated Tomoya more kindly, but like a stranger rather than family. This only hurt Tomoya even more, so he becomes a delinquent, as he is unable to participate in basketball activities any longer, and he avoided returning to his home early enough to be confronted with his father. Tomoya has the intention of running away from his home, as revealed from Kotomi's path. After Story As revealed from Shino's story about Naoyuki, even though his wife has died and has become depressed, Naoyuki sacrificed everything in his life just for Tomoya's sake, hoping Tomoya to grow up to be a proper man unlike him. After Tomoya comes to term with his father, Naoyuki decides to return to his hometown to stay with his mother, claiming his role as a father has finally come to an end. Clannad (Movie) In the movie, Naoyuki works a graveyard shift instead of staying home and becoming a drunk. He also cares about his relationship with Tomoya and even tries to ease his son's depression in order prevent his son from becoming like him. (Source: Wikipedia)
Yukine is a second year student who hangs around in the library's reference room during lunchtime. She takes care of many newcomers from other schools who also happen to be delinquents - in particular, people who knew her brother. She's very kind, and avails Tomoya and Youhei an instruction book for magical spells for them to try. Yukine is actually involved deeply with the story relating to the delinquents. Her brother is well known for being a delinquent, and this sometimes gets her into different situations involving the delinquents of the town. It is later revealed, in After Story, that her brother died and nobody knew that other than the group of people that reside on her brother's side. Yukine later helps reunite the members of opposite gangs, and they all end up being friends.
A hero of Regium, he was the commander of the Ranger Regiment, an inter service special forces unit. He recruited Mills when he was working as a pump attendant at a gas station, when ordinarily only elite members of the military would have been selected. Near the end of the training, Colonel Classad led a rebellion involving several platoons of active duty Rangers to seize the SAA at the training camp, the rebels's intention was to start a war with Dragnov as they were dismayed by the government's lack of honor and willingness to give in to Dragnov in regards to territorial demands. Classad however deliberately forced a confrontation with Mills and forced Mills to shoot him after a lengthy battle, which transformed him into the killing machine "Genocide". Mills then wiped out the other rebels single-handedly.
Tajima is one of the men who was treated by Yukine when they was after a brawl.
Kouichi's aunt from Ritsuko's side and class 3-3 deputy homeroom teacher. She gives her nephew advice on how to make it through Yomiyama through a series of "rules". One of them is to separate the private life from school life, thus Kouichi addresses her as Reiko at home, and Ms. Mikami at school. She is also revealed to be the extra/dead one. Reiko was murdered about a year and a half before the accidents started to happen.
Sodou is one of the men who was treated by Yukine when they was after a brawl.