Here are the characters from every universe that involves in the story.

Sonic universe

• Sonic the Hedgehog
• "Miles" Tails
• Knuckles the Echidna

• Shantae universe

• Shantae the half-genie girl

• Clone Wars universe

• Ahsoka Tano
• Captain Rex

• Halo Universe

• Master Chief
• Cortana

• Uncharted 4 universe

• Nathan Drake

• RWBY universe

• Ruby Rose
• Weiss Schnee
• Blake Belladonna
• Yang Xia Long

• Final Fantasy IIV remake universe

• Cloud Strife
• Tifa Lockheart
• Barret Wallance
• Aerith Gainsborough
• Red XIII

• Legend of Korra universe

• Korra

• COD: Modern Warfare 3 universe

• John Price
• John "Soap" MacTavish
• Yuri
• Nikolai

• MLP universe

• Twilight Sparkle
• Rainbow Dash
• Applejack

• Bioshock Infinite universe

• Booker Dewitt
• Elizabeth

Wolfenstein universe

• BJ Blazkowicz