Okay so:
Bowser have many sons,right?it can't be impossible that he doesn't have a nephew!
So the nephew,who is named...let's say Pako?decide to visit his uncle...
And just the front of the castle,he is amazed,to him,his cousins are king of the kingdom!
So then they meet each others.
Pako is brave,but naive...
And the koopalings are up to something:they decide to tell him one big lie...
Mario and luigi are evil guys,And they kidnapped their MOM,PEACH!!!
And of course,they discribe mario and luigi,so he can know...
The poor naive koopa beleive them,and decide to go and save peach!
...But a little after his adventure begins...
...something familiar,some shapes...
...WARIO AND WALUIGI?!?!?!...
Pako can't do a thing about the fact that they're close to mario and luigi,and his though of them get even worse!...
That's really a bad start...
I remembered this after thinking it could be an element of sm4sh story,but the character pako would only be a Jr. alt though...but if he could get his own game,it would be a 3d "newgrounds rumble" gameplay,with many power ups(like the shell throwing,while you attack you can throw your shell like a boomrang that have a round trajectory,and can flaot like in bowser's inside story)