Skyfire is the Japanese name for Jetfire, and here Dark implies Evil. This then is Evil Jetfire from before he joined the autobots.
His alt mode is roughly an F-14 fighter jet, and he features detachable rocket boosters. In robot mode, the rocket boosters act as dual over-the-shoulder cannons. He has a removable helmet, two arm-mounted rocket launchers, and a double barreled blaster.