Dr. Akihabara is a one-off character from the notorious episode "Computer Soldier Porygon"—best known as the installment that triggered seizures in viewers and got banned worldwide. Because of that incident, he's essentially stuck in Japan and never showed up in the anime anywhere else.
His name is pretty on-the-nose: Akihabara is a Tokyo district famous for its electronics shops, so naturally he's an electronics expert.
Content compiled by AnimeList.moe from publicly available sources.
