This is a suggestion i like the best with this suggestion you can do /shrink and it will make u as tiny as an ant if possible and you can do /normal to be the normal size again and if you want to get big you can do /grow and you will grow big like if you were Antman for an example and u got too grow big to save ppl and u started to grow now u can do that ingame but with /grow you can (This will only work for Donators and up)

Here is 2 videos for shrinking and growing    

and for growing  

  sorry if this vid was crap couldnt find any better

"grow big like if you were Bill cipher" I suggest you use an actual example, not everyone is familiar with the show, besides, Bill is not permanently big, he can change size depending on what he needs ;p

 Well should i go with antman since he can go big and small?

Ill edit the post to antman and add 2 videos for it

Actually, I know how to link this to Doctor Who, if you want to hear it.

Have you ever seen Invisible Enemy or Armaggeddon Factor/The Key to Time Arc?

 No not really

http://tardis.wikia.com/wiki/Dimensional_stabiliser

"The item could be used to change the dimensions of living beings or other external targets. In 5000,Professor Marius used the relative dimensional stabiliser of the Doctor's TARDIS to shrink down clones of the Fourth Doctor, Leela and Lowe, and enlarge the Nucleus of the Swarm, bringing it into the macrocosm world. (TV: The Invisible Enemy) By using the dimensional stabiliser of the Drax's TARDIS, the Fourth Doctor and his fellow Time Lord reduced their own size in order to catch the Shadow. (TV: The Armageddon Factor)"

-Tardis wiki

 Well make a suggestion on it ill help u later