The fighters have no clue each other even exist. This is so I can make my own relationships without canon ones being in the way. So, I can make Mario and Bowser best friends despite them being enemies in the canon. This also doesn't have any shipping. I will make some people friends with others but that is the extent.
Tabuu was relaxing on his chair. His army of Primids, Spaaks, and others in which he called themselves "The Subspace Army". He as feeling really bored as of late. He already wreaked havoc over his native world. Currently there are no living things on the planet besides the Subspace Army. Despite Tabuu being stuck on this planet for his entire life he met some friends that had an instant connection. He actually had a meeting with them. It was about time he went there. Tabuu met them in a strange arena in the middle of nowhere. He was there waiting for them. He didn't wait long. Master Hand and Galeem came down. Galeem could not talk, but he could understand whap people are saying. In order to get his word across he uses Master Hand, who can talk. Galeem sends waves of energy to Master hand that translates into words for Master Hand to speak. "Did your army build the weapons. It is very necessary" Master Hand said.
"Why Galeem, do you not have confidence in my army" Tabuu laughed.
"Just, is it done" Master Hand said.
"Yes, yes, it is. Did you do your part" Tabuu asked.
"Yes, I have copied the Master Hands and they are waiting for my orders" Master Hand said.
"Well, let's not waste any more time" Tabuu said. Tabuu and Galeem fly up into space and use as much power as they can to bring the worlds together. Master Hand has an aura around him, so he is unaffected by the power. Even people who are in space mostly will still be affected. They way Tabuu and Galeem makes sure that everyone is affected is by shooting their light over the entire universe. Once the lights reach the ends of the universe it starts to bring the world's and galaxies together. The worlds collide into Tabuu's natural world which is called Ultimateom. After an hour they come back down and while coming down they notice that the world was larger. When they got down they saw a lot of color balls in the sky. One got close to them it looked like a yellow fox with two tails. There were billions of other things like that. Tabuu and Galeem would've done more with it, but they were heavily weekend. They went into a slumber to regain their energy back. The Master Hand was deemed with the task to watch over the world see if anything changes. He is however not able to mess with anyone or anything. Master Hand did what he said. He flew around the massive world to see if there was anyone alive. He then saw someone. It looked like a middle-aged man in a red shirt and blue overalls. Master Hand flew higher up so that he can still see the man yet not be seen himself. The overalled man got up. He looked around. He started to walk in a random direction. He soon found himself in a town. He didn't know this existed in the mushroom Kingdom. He just left the classic dessert he is so accustomed to being in. He was now in huge city. There was also a lot of purple. He continued to walk around the massive city. He soon found himself in front of a statue.
"Kumatora" someone yelled out. "Boney, Duster. Come on guys this isn't funny" the voice continued. The Overalled man looked for the owner of this young sounding voice. He soon saw the cause of the voice. It was a kid with blonde hair in a really fancy way. His clothes seemed dirty and he had tears in his eyes. The kid looked over and saw the man. The kid instantly retreated back.
"It's ok" The man said, trying to calm down the lost, sad kid. The kid stayed hidden. "I'm very confused about where I am, could you help me. Am I still in the Mushroom Kingdom". The kid poked his head out.
"Mushroom Kingdom" The boy said confused. "Never heard of it"
"Then where are we" The man asked. The boy got a little more unhidden.
"This is called New Pork City" the boy said. The man got closer which caused the kid to back up a bit. The man put his hands out showing he means no harm.
"My name is Mario, I'm glad I ran into someone else" Mario said. "What's your name".
"Lucas" Lucas said. Mario brought a hand out and it took a while for Lucas to walk up and shake it. "Is the Mushroom Kingdom where you're from" Lucas asked.
"Yea, I'm a plumber. I am most known in my hometown for saving the princess in multiple occasions" Mario said. He was having a mental flex in his head for being the one to save the princess. "Where are you from".
"A little village called Tazmilly on Nowhere Islands. I lived there with my…. Family" Lucas said instantly looking down and started to cry. Mario was going to ask about his family but decided not to. Mario messed with Lucas' hair. Lucas smiled but Mario didn't see it.