Adults

• Joshua Jones - A young man who lives in the Karia's Residence and travels by his canal boat with his dog Fairport. His main job is to transport goods along the canals but he is more than willing to utilize his boat to help out others in a crisis.
• Admirable Bapu Karia - A retired Indian admiral who served in the Royal Navy and is always putting his experience to good use in everyday tasks. He is Datsa's father-in-law and Ravi's grandfather.
• Dakasha "Datsa" Karia - The admiral's daughter-in-law and Ravi's mother. She is a very cheerful woman and her first name is only mentioned in the episodes "Tortoise" and "Boomer". Ravi's father never appears, implying that Datsa may be divorced or a widow.
• Joseph "Joe" Laski - A Hungarian-born farmer who lives on a farm on a hill near the tunnel and he takes care of his horse Trojan.
• Daphne Peacock - The local vetarinian who is often called in to take care of sick animals and she is the only character who is seen to drive a car (however Joe Laski is seen driving a tractor in one episode).
• Wilton Cashmore - A local rich busy bee who likes to boss his staff around, especially Spanner. He goes to great lengths to try to impress his own boss, the unseen Mr. Biggott. He can be a nasty man at times when he does not get what he wants. He is the father of Fiona, but his wife and Fiona's mother is never seen or mentioned on the show, implying that Mr. Cashmore may be a widower or divorced.
• Mr. Biggott - Wilton's boss. Although he never appears, Mr. Cashmore speaks to him on the phone in almost every episode. The closest the Biggots get to being seen by the audience is in the episode "Haywire".
• Mrs. Biggott - Mr. Biggott's wife and like her husband, she never appears. She is only mentioned in the episode "Haywire".

Teenagers

• Sharon Cope - A ditsy but bubbly blonde lady who sells food from her bistro wagon by the canal.
• Spencer "Spanner" Wilkins - Sharon's boyfriend; a lazy, accident-prone, orange-haired chap in his early twenties, who does odd-jobs for Cashmore and various other characters. He often skives off work to go and eat at Sharon's cafe.

Children

• Ravi Karia - An eight-year-old boy, Datsa's son and Bapu's grandson.
• Fiona Cashmore - An eight-year-old girl, Wilton Cashmore's daughter.

Animals

• Fairport - A Terrier crossbreed dog, Joshua's faithful animal friend.
• Trojan - Joe's brown horse.
• Boomer - A colourful parrot who was once loaned to the admiral.
• Tearaway Trevor - Ravi's pet tortoise.

VHS

One VHS volume of the series was self-distributed by S4C Video Classics for Wales, known as "Gee Ceffyl Bach a Thair Stori Arall". This VHS contained the same four episodes from the Horseplay VHS, albeit in Welsh.

Two VHS volumes were released in the United Kingdom by BBC Video. The first volume - "Horseplay", released on 15 June 1992, contained the episodes "Horseplay", "Haywire", "Treasure", and "Boomer". The second volume - simply titled "Joshua Jones 2", was released on 5 July 1993, and contained the episodes "Tortoise", "Sting", "Spook", and "Plum Crazy".

DVD

In Australia, Reel Entertainment released two DVD volumes each containing six episodes in 2005, simply titled "Volume 1" and "Volume 2". These were "Carry-case" releases, and it was soon followed up with a standard "2 DVD Set" featuring both volumes, making up the complete series.

DVDs of the series have also been released in Poland.

Despite being a British show, the series never had an official DVD release in the UK.