The term "Taxi Driver" is conjectural. The real name is unknown, and a non-canonical nickname or title is used instead. See the reasons for this title in the "Behind the scenes" section below and/or the relevant discussion on the talk page, if they exist.
The Taxi Driver was a local robot worker native to Kerwan, who piloted a Taxi. After the invasion of Aleero City, Victor Von Ion throw him out of his taxi and escaped in it.
This robot worked as a taxi driver in Aleero City. During the battle of Aleero City, Blarg lieutenant Victor Von Ion hijacked and escaped in his taxi, throwing him out. His taxi was used several times on Kerwan and a few other planets by Ratchet and Clank.
At the end of the Ratchet and Clank Movie, his taxi can be seen in Grim`s workshop.