- Big Brother Mentor: He serves as this to Elvis.
- Catchphrase: "Great Fires of London!"
- Not So Above It All: Sam's inventive streak can sometimes undermine his emphasis on fire safety.
- Nice Guy: He's a very pleasant, kind-hearted person and rarely (if ever) loses his temper.
- Genius Ditz: He may not be very bright, but he's extremely competent at his job.
- Lethal Chef: A Running Gag is that his food is absolutely atrocious. Although, considering neither Sam nor Steele have ever tried their hands at cooking, one has to wonder how much worse THEIR food would be.
Station Officer Steele
- Catchphrase: "Now who needs the Fire Service?" and "Action stations, men!"
- Jerk with a Heart of Gold: He can be rather strict and bossy, but he cares very much for the well-being of his firefighters and the people of Pontypandy.
Arnold Mc Kinsley
- Meganekko: She's portrayed as this in the CGI version.
- Parental Obliviousness: She's oblivious to her son being a troublemaker.
Sarah & James
- Disappeared Dad: Norman's father has never been seen or even referenced. Maybe this is part of the cause of his behaviour?
- Four Eyes, Zero Soul: Norman wears glasses and is a prankster.
- Jerk with a Heart of Gold: Despite his love of mischief, he often becomes a hero by summoning help for others in need.
- Too Dumb to Live: Sometimes the reason he ends up in danger.
"Well, you heard it here first, Space Spotters! Fireman Sam says that aliens in Pontypandy are not from mars! They're from a much more distant planet!"A new character for the 2017 special "Alien Alert". He is an alien hunter and a television presenter for the TV show "Alien Quest".
Voiced by: David Tennant (UK), TBA (US)
- Anti-Villain: Despite him being called a "humorous villain", he is actually a nice guy with an adorable smile and a cheerful and friendly attitude. He's not against Fireman Sam, he doesn't harm anybody. The only bad thing he does is run around in an alien costume, accidentally start a fire, and use remote-controlled UFO's to surprise people in Pontypandy.
- Catchphrase: "Hi there, Space Spotters!" and "Space-tastic!"
- Cloud Cuckoolander: Buck Douglas himself. He acts pretty weird (in a good way) at some points. He has a pretty strange rotating trademark salute.
- Depraved Kids' Show Host: Buck Douglas is a very nice television presenter who enjoys hosting "Alien Quest" and adores his fans. But, when he's off-screen and/or there are no fans around, he has an "evil" plan to dress up like an alien and to run around, controlling UFOs to surprise people in Pontypandy. Fireman Sam, and later Norman, notice this. In the end, Fireman Sam and Norman catch Buck Douglas and show the villagers that he's actually a "bad guy". Although, he isn't that mean. He's never against Fireman Sam and the villagers of Pontypandy, and he never harms anyone, but he did accidentally start a fire after Norman shouted, "Gotcha!" to him.
- Deadpan Snarker: Buck Douglas is like this at some points.
- Expy: Buck Douglas looks very similar to Wilf from the 2014 CGI film Postman Pat: The Movie. They're both even voiced by the same voice actor.
- He also looks very similar to a blonde version of the tenth doctor from Doctor Who, who is also played by the same actor.
- Film the Hand: While Buck Douglas was filming his show in Pontypandy, Bella Lasagna interrupts the show. In response, Buck Douglas approaches the camera in anger and almost covers it with his hand.Buck Douglas: Cut, cut CUT!!!
- Ink-Suit Actor: Buck Douglas looks similar to a blonde David Tennant with a soul-patch on his chin. David Tennant is the voice actor for Buck Douglas, that's why the character looks like him.
- Non-Dubbed Grunts: In some dubs of the film, Buck Douglas' grunts while he was trying to fix the giant UFO and his scream while he was running away from a forest fire and was scared by Norman Price were not dubbed.
- Ooh, Me Accent's Slipping: Sometimes, when he's saying certain things, Buck Douglas' English accent turns either Scottish, Northern Irish, or Welsh.
Don Sledgehammer (AKA Don Bloomburg)
- Voiced by: Kerry Shale (UK and US)
- Voiced by: John Barrowman (UK and US)