Equestrian Heroes Unite

Hey Guys so i want to make a new story and my first story but i need help from you guys i chosen 3 of the heroes which is Sonic The Hedgehog, Mario, & Link and i need 3 more characters so i will need 3 more heroes and 7 Villians.

Preview: the story will be as a strange Portal Appears out of no where sucking the heroes in to Equestria 4 out of the 6 Heroes knows each other (Mario, Sonic, Link, & [enter fourth character here]) They all appear at the same place at the same time one by one Rainbow Dash, Twilight, Fluttershy, Rarity, Applejack, & Pinkie Pie see the heroes. The Sky gets Dark all of the sudden and out appears Count Bleck, Discord, Gannondorf, & Dr. Ivo Jullian Robotnik or Dr.Eggman. Count Bleck sends out his minions and attacks the main 6 and the 6 heroes Link Sonic and Mario manged to defeat them all in no sweat. Eggman decides to inform sonic and the others that They hid all of the Chaos Emeralds and the Power Stars as well as the Elements of Harmony and they must look for them to "defeat" them if they have the Guts. Sonic acting his cocky self decides to tell eggman that He does have 1 of the Chaos Emeralds. Mario Pulls out 1 of the power Stars as well. The villians Suprised by this just say that they have 3 days left because of the Space Colony Ark as well as the Moon which is going to fall and the Princess cant not use they're magic. The Main 6 shocked by this untill sonic smirkes and says "Come on is that all you got i save the Earth from Egghead over here more than twice hehe this is baby steps for villians i mean sersiouly do you know who i am im the world's fastest hedgehog Sonic The Hedgehog!". RD shock at this untill at spear hit the heroes link gets back up and says " Gannon you will be defeated once and for all as well as you 3". Thats my preview and help i need from you guys hope you help me out and thanks. Futhermore i will also like help with levels or places the main characters will wind up too also. i will need 7 heroes 7 enemies and the 9 worlds. (yes 9 worlds because of each character theme as well as they're personality) if you guys can help me with that or atleast assist me with the story with the plot, enemies, worlds, etc.