Nylon was the final boss of the main tournament because it was basically to celebrate and represent custom characters, which is why they were all the main bosses (and of course Goku and Vegeta, I mean, it's Dragon Ball). Ban is XV2's character, Wiz is Ultimate Tenkaichi's, Ace is XV1's, and Nylon is from Dragon Ball online, the first ever Dragon Ball game to feature a customizable avatar. They made him the main finale because he's the one that started it all. And then Kane is one of the villains from Jump Force. I'm pretty sure he and Galena were an April Fools teaser but people were actually really eager to see them included so Revamp went ahead and committed to making them full characters. Kane was lumped in as a bonus boss since Jump Force also has a customizable avatar but there is basically no official look for them, much less a name.
