@SonicXCaps Knuckles the Echidna and Sonic the Hedgehog:
1.) Metal Knuckles and Meta Sonic style
2.) Sonic Boom style
Tails Prower meets Mana the Hedgehog/Dark for some reason (from Sonic the Hedgehog series)
What if... Mii Fighters vs. Infinite (former Jackal Squad leader; the Ultimate Mercenary) (from Super Smash Bros. series, Nintendo, and Sonic Forces, Sonic the Hedgehog series)
Besides Avatar/Custom Characters/Rookie, What if... Sega and Sonic Team add Mii Fighters in Sonic Forces, Sonic the Hedgehog series? Similar to Super Smash Bros. series.
Hint: I know this never happened.
Belle the Tinkerer/Puppet reaction of (Classic) Sonic (from Sonic the Hedgehog series)
(Part 2) Shadow the Ultimate Lifeform vs. Eclipse the Darkling (from Sonic the Hedgehog series)
Venom (2018 film) style (from Sony Universe of Marvel Characters
Shadow: Cowards run. I win. (or) No. I won't let you to destroy this world.
Bokkun and Mana the Hedgehog/Dark (from Sonic X, Sonic the Hedgehog series) Toy Story (first movie; 1995) style
Bokkun: (making that face to scare Mana)
Mana: Oh, How are you doing, Bokkun?
Bokkun: Were you scared? Tell me honestly.
Mana: Whatever. (walking away)
Shade the Echidna meets Belle the Tinkerer/Puppet (from Sonic Chronicles: The Dark Brotherhood, Sonic IDW comic book series, Sonic the Hedgehog series)
Blaze the Cat and Mana the Hedgehog/Dark (from Sonic the Hedgehog series)
Blaze the Cat = Iblis (fire element)
Mana the Hedgehog = Mephiles the Dark (dark element)