Author's note: sorry for not updating in 5 million years. I lose motivation. Anyways here's the first alternate ending.
Tails felt the chaos energy flow through him. It felt amazing. It felt like the greatest high. Tails shuddered in ecstasy and pleasure. He then started to giggle. Shadow noticed this and said "hey, you okay?" The kitsune looked to the Crimson striped hedgehog and laughed "you bet, I'm okay! This feel amazing! I feel… Powerful!" He started to laugh harder and more shrilly. Silver asked "is this supposed to happen?" Shadow shook his head. Tails's body then turned black and his eyes a pure white.
Shadow's eyes widened "EVERYBODY RUN! GET OU-" he didn't get to finish his warning. Shadow looked down and saw a tail pierce his body. He started gasping in pain "M-M-Maria.." The appendage retracted and Shadow fell to the ground. "WHOSE NEXT?!" A dark voice cried out. Everybody scattered around the void world to hide. Tails flew and saw Amy. "I found you!" Amy turned around and gasped "Tails! Please don't kill me, please! I will do anything! Please!" The kitsune chuckled in a low voice. "I'm going to have fun with you!" Tails charged her and grabbed her. He then licked his lips and bit her throat out. Any's face twisted in pain and she started to cry but no voice came out.
"You taste… Amazing!" Tails then snapped her neck. Over the course of a few minutes he found everyone and killed them in different ways. He then felt a presence behind him. "Sonic… How nice of you to join me." He turned to see a transparent Sonic. "Buddy… Snap out of it! Please!" Tails laughed insanely. "This is SO fun though! You don't like it?!" Tails started to choke Sonic, although he was in another plane he still managed to harm him.
Sonic reached out as if he were begging some higher power for this to end. Miles crushed the Blue Blur's windpipe. After Sonic could speak no more, Miles threw him to the ground and curb stomped his head. He looked up to the sky and saw Solaris. He flew up to join the Sun god and thus was the end of the world.
Author's Note: sorry for not updating in awhile. More non canon endings to come! R&R!