These two Autobots are very different in nature, but both can deal out damage to the Decepticon forces as well as the other!
Bluestreak is the prankster of the Autobots, with a good sense of humour, and a strong fighting spirit.
Bluestreak was reconfigured by Teletran 1 into the image of an Earthly Datsun sports car, with levels of speed that clearly befit his name. He can sometimes be cocky and tends to do things on the spur of the moment. He is also not the best at following orders. In robot mode, he carries a gun which fires high voltage electric bolts, capable of recharging depleted circuits as well as damaging them (Ref: "S.O.S. Dinobots").
Bluestreak was seen briefly working on Kup's roadblock just before the Autobot City Massacre, and a marker for him was later seen in the flying Autobot Mausloeum, providing incontrovertible evidence that he was terminated in the conflict. The destruction of the mausoleum by the undead incarnation of Optimus Prime prevented any chance of Bluestreak ever being returned to life.
The remains of a robot greatly resembling Bluestreak were glimpsed in a mass grave on Cybertron. The Megatron of the Beast Machines continuity may have used Bluestreak's remains in production of Vehicon drones.TRAILBREAKER
Trailbreaker, by his own admission, is "not built for speed", but is ceratinly tough enough to make up for it!Trailbreaker transforms into the likeness of an Earthen camper van. In this mode he has a radio aerial capable of intercepting tranmissions on Decepticon wavelengths, making him, along with his fellow tracker, Hound, perfect for espionage and information gathering. In robot mode, in place of his left hand, Trailbreaker has a force-field generator, although is has been seen to take different shapes, from a three-pronged version (Ref: "More Than Meets The Eye"), to a more commonly seen single barrel. The force-field has been seen to hold back fire (Again, ref: "More Than Meets The Eye"), large amounts of water (Ref: "Triple Takeover"), even the high-intensity flame breath of the Dinobots (Ref: "Dinobot Island"), and, of course, Decepticon artillery. However, the forcefield does not prevent ricochets from blasts which strike it, making it a danger to use in close quarters.It is unclear if Trailbreaker was present at the Autobot City Massacre of 2005, but he was not seen again thereafter, as is presumed either terminated or in retirement.