This mod allows you to change your size! When you are in creative mode, if you click “R” you get bigger if you click “F” you get smaller. To change the size of mobs you need to hold down the “R” and “F” key while holding a stick. In survival mode, you need to make potions.
Add Nether Wart to Water Bottle to make Awkward Potion.
Add Red Mushroom to make Potion of Embiggening.
Add another Red Mushroom to get Potion of Downsizing.