Transformers is a franchise owned by Hasbro and TakaraTomy (known collectively as HasTak). It's comprised of the three major components: toys, movies, and comic books. In fiction, they're race of alien robots from a metallic planet called Cybertron, and they have a bad habit of ending up 4 million-year-long wars that drain their planet of resources and cost thousands of lives. In this war, they are divided into two factions, the heroic Autobots and the evil Decepticons, but there's been other parties involved, like the Maximals, Predacons, Quintessons, Mercenaries, etc.

You can make a skin of any Transformers character, as long as it's not an OC. I literally don't care what you make, and obscure characters are always welcome.

All participants will receive a Cyber Key. Cyber Keys (or Force Chips in Japan) are devices from the Cybertron cartoon containing a fragment of Primus' power (Primus = creator-god of the Transformers), and are summoned every time the characters need extra powers in the show. In the toyline, every figure (sans the Legends of Cybertron size class) came with a key that could unlock spring-loaded gimmicks. For instance, Starscream's deployed blades from his null-ray cannons. The keys in the show/toyline were based on what faction their owner belonged to and what planet they were from (Cybertron or one of the four colonies), but this trophy has a half-Autobot, half-Decepticon symbol design instead.

If you get third place, you'll receive the Omega Lock, another Cybertron device, which was used in the show to channel the power of the four Cyber Planet Keys - each Cyber Key contains a fragment of a Planet Key - containing Primus' essence. Once fully-powered, it could be used to reawaken Primus or, as Starscream did in episode 29, make a regular-sized bot giant.

The second place winner will get the AllSpark itself, the mystical artifact of Primus used to create Transformer life. Basically, having it is like having the power of God in your hands. In the movieverse and Animated continuities, it could be divided into shards, and in the War for Cybertron Trilogy, Megatron (at Shockwave's suggestion) planned to use it to reprogram the Autobots into Decepticons. It doesn't always look like a cube, as it can also appear as the aforementioned shards or a 20-sided (I believe) item.

Lastly, the user with the honor of getting first place gets none other than the Matrix of Leadership itself. In the Marvel comics, the Creation Matrix was used to create life, but later stories saw the AllSpark supplanting it. The Matrix is an artifact of the Primes, a vessel of holy energy said to be able to light the darkest hour. In the modern era, it is a symbol of leadership, being carried in the chest of the Autobot leader, and even the Decepticons fear its power (though they also covet it).