Back when I was younger, I watched Digimon Frontier for the first time. Despite everyone else hating it, I simply adored it, and above all, Takuya. He was/is just so cool. 8D
So I adopted his name for my online gaming persona's. It's stuck with me ever since, but I add different flairs to it depending on how I wish to present myself. In this case, I took the Tak from Takuya and added on -kun, since I've always thought -kun was adorable.
And it rolls off the tongue easy. Try it. Tak-kunTak-kunTak-kun. x3