Well, obviously Bowser and Dark Bowser are the main characters. Bowser is the well - known villain from the Mario series, and Dark Bowser is his darker, more menacing counterpart.
Another possible plotline is that Dark Bowser is actually a part of Bowser that he has been suppressing. The fanfic could explore Bowser's internal struggle as he tries to come to terms with this darker side of himself. It could also show how this affects his relationships with other characters, like Princess Peach and his minions.
It's likely a story about the conflict or interaction between a kid and Kat, with perhaps some connection to Bowser's inside story. Maybe it involves the kid facing off against Kat in a world or situation related to Bowser in some way.
The main characters are likely the kid and Kat. And since Bowser's inside story is part of it, Bowser might also be an important character, even if not a main playable one.
One difference is their appearance. Dark Bowser looks more menacing with a darker color palette. Also, Dark Bowser seems to have more powerful attacks compared to regular Bowser.
One key feature is his physical strength. He can easily overpower many of the characters in the Mario world. Another is his fire - breathing, which he uses as a weapon against his enemies. His spiked shell also makes him difficult to attack directly. And of course, his leadership over the Koopa Troopas is a notable feature.
Well, it's hard to say for sure. Bowser is a powerful character in his own right, with his fire - breathing and brute strength. But Dark Bowser is an even more menacing version, often having enhanced powers. It could really go either way depending on how the fight plays out in the game's story.
One possible plot could be that Rubeus J accidentally offends Venoct. Venoct, being a proud Yo - Kai, demands satisfaction through a fight. As the battle approaches, both Yo - Kai start to gather allies. Rubeus J tries to find Yo - Kai who are good at trickery like him, while Venoct gets support from the more powerful and honorable Yo - Kai. The fanfiction could then focus on the build - up to the battle, the different strategies each side uses, and the final showdown.
In some fanfics, there might be a plot where Bowser Jr. tries to prove himself to Bowser. He might take on a difficult task on his own, like stealing a precious jewel from a well - guarded castle. This shows his growth and determination to be a worthy heir to Bowser. And it also adds a touch of family - like relationship exploration between them.
One possible theme could be family. As Bowser and Bowser Jr. are father - son, the fanfic could explore the dynamics of their family relationship. It could show how they support each other, or how Bowser is trying to raise Bowser Jr. to be a worthy heir.