Miki (御木) is a senior in the football (soccer) club of the school that Takumi attended. He drives a Toyota Celica GT-Four (ST205). He serves as Takumi's last opponent in the Akina's Eight-Six arc, and as his penultimate opponent in Third Stage.
First Stage, a dream sequence is shown, where Takumi punched him in the changing rooms for bragging about his sexual exploits with Natsuki, during the time when Takumi was ignorant of the truth.
During the winter in
Third Stage, he kidnaps Natsuki and forces her to come to Lake Akina with him. His plans are foiled by Takumi who gets Natsuki's call for help and chases Miki with his Trueno until he spins out on the snow after his steering wheel gets stuck and Natsuki escapes his Celica.
Miki being struck by Takumi in flashback
Miki's first appearance with his Celica in Volume 16
Miki doubts that both Takumi and Natsuki were working at a gas station.
Miki angry at Natsuki after he is told not to go out with him.
Miki's Celica in the manga
Miki's Celica & Takumi's AE86 in Volume 16 cover
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Miki has no knowledge on cars, save for his belief that a 4WD is unbeatable on snowy roads, especially against an FR.
Miki is the only non-racer opponent that Takumi faced, as Miki isn't a racer and their confrontation wasn't a race.
Despite not being a racer, he does appear as an opponent in Arcade Stage Ver. 3, and as a playable character in Arcade Stage 8 Infinity in the RivalSide mode. Between the manga and anime, Miki's Celica seems to change colors from silver to black, just like Kenta Nakamura's S14 changing to orange to red.