Ace Pilot: All of them are aces at manning their own vehicles. They are skilled enough to fly each other's if need be, such as Alan piloting Thunderbird 1, Virgil piloting Thunderbird 3 and Scott piloting the Fireflash, a plane that isn't even part of the International Rescue fleet.
Expansion Pack Past: According to Word of God, they all have had impressive careers before forming International Rescue. Jeff was an astronaut, Scott was an air force pilot, Gordon was an olympic swimmer, Alan was a race car driver, etc.
Overprotective Dad: A strange example for a man who routinely sends his kids into danger. Explored in Atlantic Inferno, when he goes on vacation and temporarily hands leadership over to Scott. Scott does well enough, but he can't stop himself from constantly worrying and meddling.
Voiced by: Shane RimmerEldest son of Jeff Tracy and principal pilot of Thunderbird 1, a hyper-fast reconnaissance vehicle. With his moblie base, he oversees and leads many operations. He also co-pilots Thunderbird 3 together with Alan.
Voiced by: Ray Barrett (series and Thunderbirds Are Go), Keith Alexander (Thunderbird 6)Second son of Jeff Tracy and operator of Thunderbird 5. He ostensibly shares this duty with Alan, which would also make John a principal pilot of Thunderbird 3, but...
A Day in the Limelight: He gets into action in a grand total of one episode: Danger At Ocean Deep. Even then, he didn't do much.
Hero of Another Story: John claims he has been on "a dozen or so" rescues, despite Danger At Ocean Deep being the only episode in which we see him take part in one.
The Unfavorite: Gerry Anderson hated this character with a vengance. To what extent? He was initially unimpressed with the design of Thunderbird 5, but he approved it anyway so that John would be stuck in space for most of the series.
Voiced by: David GrahamFourth son of Jeff Tracy and principal pilot of Thunderbird 4.
Deadpan Snarker: His "thing" was being a bit more mouthy than the other brothers.
Hot-Blooded: Usually lighthearted, he tends to get pretty exited in action compared to his brothers. For instance, when TB2 is grounded for repairs during an emergency, Gordon seriously proposes piloting TB4 on a trans-oceanic trip and the rest of the family have to gang up on him to make him realize that idea is dangerous and completely impractical.
Talking to Himself: While this was all over the place in the series, Gordon is the most obious example, as he basically sounds like Brains without the stammer. His VA, David Graham, also did Kyrano, Parker and many one-off characters.
This Looks Like a Job for Aquaman: As the underwater craft and smallest Thunderbird, TB4 was used only occasionally. He takes turns with Alan and Brains for backup on TB2.
Voiced by: Matt ZimmermanYoungest son of Jeff Tracy, principal pilot of Thunderbird 3, and all-round crewmember to the point of being a jack-of-all-trades. He often comes along in Thunderbird 2, flies Thunderbird 1 when Scott is unable to do so and shares duties with John monitoring Thunderbird 5.
Crazy Jealous Guy: Alan can be quite upset when Tin-Tin shows interest in another man. This is especially evident in "End of the Road" and "Ricochet". To add insult to injury, in both episodes Alan ends up having to rescue his rival.
Dogged Nice Guy: He has a crush on Tin-Tin, especially evident in End Of The Road. The romance never really takes off, as the series had other things on its mind.
This Looks Like a Job for Aquaman: Suffers from this even more than Gordon, as TB3 is the most rarely-seen Thunderbird. He gets compensation as he comes along with Virgil more often.
Voiced By: Christine FinnMother of Jeff, grandmother of the five Tracy Brothers. She lives in her own house at first, but later in the series moves in with Jeff and the boys. Usually a background character.
Voiced by: Sylvia AndersonLondon Agent, blue-blooded lady, owner of a fancy house and a fancier automobile and Ensemble Darkhorse, Lady Penelope is the heir of British aristocracy and International Rescue's go-to lady for espionage, intelligence and investigation.
Depending on the Writer: Either a cool, collected Badass who takes no shit from anyone, or a spoiled, pompous Neutral Female who panics as soon as she fears she might get her hands dirty. Most episodes have her lean toward the first, fortunately.
The Main Characters Do Everything: Is invariably called out to every mission, no matter where in the world, despite specifically being the London agent. See the episode The Imposters for a good example of this (although she did team up with IR's local agents in the area)
Voiced by: David GrahamLady Penelope's Cockney Battle Butler, Parker has quite the past as a burglar and serial bank robber. Lady Penelope saved him from a life of crime, leaving him utterly devoted to 'er Ladyship. His vast underworld connections sometimes come in handy.
Anti-Hero: A few episodes establish that Parker's days as a burglar aren't quite behind him.
Arguably the most prominent example is in "Vault Of Death". Upon hearing there was an problem at the bank, he believes it to be a robbery conducted by an old cellmate (when Parker was convict) nicknamed Light Fingered Fred. Parker is unwilling to foil the plans of whom he considers an old friend and attempts to divert Penelope and Lord Silton away from the bank. The actual emergency was that a member of staff, Lambert, was trapped in the vault with the air was being pumped out and the bank needed the one key that could open the vault. Even though he didn't know it, Parker's diversions could very nearly have cost Lambert his life.
Voiced by: Ray Barrett (series and Thunderbirds Are Go), Gary Files (Thunderbird 6)A mysterious terrorist with Psychic Powers and a perchant for masquerade who lives in a palace, deep in the jungles of Southeast Asia. He violently opposes International Rescue and will put everyone and everything in danger to steal their secret technologies. He often works alone, but has been known to sell his services to even greater and more mysterious powers.
All There in the Manual: "The Hood" is never mentioned as a name or alias for this character in-series. The only aliases he goes by in-series are "Mr. Stutt", "Agent 7-9" and "Black Phantom".
Unknown Rival: Most of the The Hood's schemes revolve around stealing all of International Rescue's secrets and selling them to the highest bidder. Conversely, International Rescue is barely aware of his existence, apart from a vague notion that they have "enemies". Though "Martain Invasion" brings the latter up for debate:
Virgil: You know Scott, I've been wondering whether that "Stud" could be the agent that's been after our plans ever since we went into the rescue business.
Scott: Yeah, I was wondering the same thing myself Virgil. Anyway, whatever disguise he wears...we'll get him. One day.
Commander Norman is the director of London International Airport. He has been present for several rescues effected by International Rescue, including their first ever mission.Voiced by: Peter Dyneley