Shadow and Trixie are locked in mortal combat. Dash has discovered a great power for herself. while Sonic has yet to scratch the surface of his fight.
those of you who played Sonic 06 will know what Chaos Assault and Chaos Boost are. to those that want better imagery, just watch Shadow gameplay for that game on youtube.
Neo Metal Sonic is the form that Metal Sonic had throughout Sonic Heroes, before transforming into a giant thingie. if you never played that game then look him up on DA, lot of fanart for that form.
MLP:FIM is copyright of Hasbro and Lauren Faust
Sonic is copyright of Sega and Sonic Team
Lightning Dash is a Super Form concept for Rainbow Dash made by yours truly