Using This Simple Command, YOU CAN MORPH INTO ANY MOB!
The first thing you are going to need to do is copy the command. next, paste the command into a command block and select the following
Repeat, unconditional, Always Active.
Now name the mob of your choice "Morph"
I recommend you use the bat or the vex, because they do not push you around
Now put your name in the YOUR NAME HERE spot
Finally, Type /effect YOURNAME minecraft:invisibility 18000 1 (or just copy and paste it into the chat)
Now You Have Morphed Into The Mob!