Aoi Koga
Name: Koga Aoi (last, first)Age: Unsure; probably around 20 at death
Role: Guitarist
Out of the three members of Route L, we know the littlest about Aoi. We know he was the guitarist of the band, and the one who wrote the lyrics to "Eternal Snow". He was already dead when the series began, and he wasn't ressurected as a shinigami like Takuto, because he didn't commit suicide - he was killed in an accident instead.
Aoi had a girlfriend named Kouyama Hazuki. The two had a baby together - Mitsuki. Because Hazuki's mother didn't want to accept Aoi into the family, the two eloped and died in a car crash while rushing to the hospital. Route L disbanded after this.
Although there really isn't much to say about Aoi, Takuto and Wakaouji described him as a very caring and dependable person, the one you would go to seek for advice.