Characters:

Auron ~ Dereck Combow, Spriter's Resource

BlackMage ~ żUNKNOWN?, Spriter's Resource

Cat ~ ShyGuy Kingdom

Cecil ~ VideoGameSprites.net

Crono ~ ShyGuy Kingdom

Elephant's Head ~ Uhm...Spriter's Resource?

Frog ~ VideoGameSprites.net

Link ~ SemiJuggalo, Spriter's Resource

Locke ~ VideoGameSprites.net

Mario ~ ShyGuy Kingdom

Megaman ~ Spriter's Resource

Ninja ~ żUNKNOWN?, Spriter's Resource

Reina ~ VideoGameSprites.net

Rosa ~ VideoGameSprites.net

Sephiroth ~ I'm sorry, but I honestly have no idea where I got this.

Sonic ~ ShyGuy Kingdom

Sora ~ Spriter's Resource

Tails ~ ShyGuy Kingdom

Zero ~ ShyGuy Kingdom

Backgrounds and Miscellaneous:

Black Mage's Spells ~ Dark Zero, Spriter's Resource

Castle Oblivion ~ Spriter's Resource

Cloud's Sword ~ Incognito, Spriter's Resource

Contra III Street ~ Background HQ

Death Egg Tiles ~ Snowflake, Spriter's Resource

Fire Effects ~ Spriter's Resource

Green Hill Zone ~ Flare, Spriter's Resource

Ground Tiles from Mario (Episode 2) ~ Viper, Spriter's Resource

Planes of Eternal Darkness ~ Spriter's Resource

Sign ~ Debug (I think that's his name), Spriter's Resource

Winged Fortress ~ Background HQ

Wonderland ~ Spriter's Resource

Oh, thank God, it's over. Most people don't even care about giving credit, but I figure it's the least I could do.