posted to twitter and my insta so i figured id post them here too
Patrick is a nub horned unicorn that doesnt use magic bc hes lazy
spongebob is a unicorn/changeling hybrid who only uses magic for silliness and does NOT use it to cook (despite everyone being frustrated that he doesnt) he can shapeshift into different shapes for the funny joke haha
plankton is a breezie (lol)
mr krabs is an earth pony just cuz i felt like it
Squid is an earth pony who is angry at spongebob for not using his magic to its full potential
sandy is a hippogriff (haha funny underwater goes into the air mirror