Get up, ya bum
Sunburn is a Mini-Con from the Armada portion of the Unicron Trilogy.
Every member of the Aqua Raider Team is a cruel and dirty pirate, and its female member Sunburn is certainly no exception. The classic "vamp", Sunburn delights in tormenting her victims both physically and mentally.
(Note: The information on Sunburn comes directly from Linkage author Hirofumi Ichikawa, who was unable to get in as much characterization for the later DVD-exclusive Mini-Cons as he wanted in the final chapters of the comic series, as he needed to wrap up the story.)
Fiction
Micron Legend: Linkage Comics
The Aqua Raider Team was sent to Hawaii to capture the Super Stunt Team and Sonic Assault Team, or at least hold them off long nough for the Speed Chaser Team to arrive with the massive Ravenus. While Bilge and Freeboot invaded the Mini-Cons' shuttle base (finding it empty), Sunburn was on backup patrol and observed the energy discharge that signalled the unlocking of the Master Key. The Aqua Raider Team charged in, but were easily captured by the newly-powered-up Redline and Combusta.
When Ravenus captured Twirl, Sunburn joked about whether or not Redline could catch up with the escaping Bulk in time. Combusta overheard her, and used her new powers to extract from Sunburn everything she knew about the Doomstone held within Ravenus. When Redline and Kingbolt were able to stop Ravnus and contain him, the Aqua Raider Team retreated via "Trans-phase" mode, letting them slip through the energy wall and return to their dark master Unicron.
Thoguh Sunburn is not explicitly shown in the final battle where Autobot, Decepticon and Mini-Con alike faced off against Unicron, it is assumed she was part of that final battle (Freeboot is shown to have been there), and it is highly likely that she met her end there.
Toys
Sunburn is a redeco of the Sea Team Mini-Con Oceanglide, available only with volume 10 of the Micron Legend (the Japanese name for Armada) DVD in Japan. She features a pressure-launch missile in both modes.
The same mold is used by Solar.