Utopia is one of the hundred piece of an ancient being's fragmented soul. Of all those fragments it was Utopia that inherited his virtue and sense of right. As such he was drawn to the duelist who would one day reunite all those fragments. In his battles Utopia would face his greatest challenge in the Barian world, an alternate dimension with monsters that outpowered him hundreds of times over. Through sheer willpower and a bit of luck though, Utopia vanquished them all and saved two universes from annihiliation.  

Utopia is right next to Neos as an unambigiously heroic character who will put the needs of others before themselves every time. In contrast to Neos though, he's undergone even greater challenges and has no such flair for the theatric. As a king his demeanor would be far more serious and less outwardly jovial. A great base for his voice would be Optimus Prime from Transformers. He's someone who through their trials has proven they don't need to speak loud to be heard. The third line is again, meant to be called out like a fighting game attack, see the description of the project for the sort of direction that entails.