Yū Kondō was involved with the Dragon Ball manga during its most popular times, taking over Kazuhiko Torishima's position following the end of the Piccolo Jr. Saga and leaving shortly after the Perfect Cell Saga.
Kondō is said to be Toriyama's inspiration for the villainous Frieza. Kondō, for his part, had always imagined himself as the basis for Future Trunks. However, when asked about this in Dragon Ball Forever, Toriyama denied consciously basing villain characters on his editors, but admitted that he might have done so subconsciously.
Outside of Dragon Ball, Yū Kondō worked on Blue Exorcist and Sket Dance.