The Pet Buddy mod makes a miniature version of yourself and it follows you around wherever you go. If you don’t see it at first just press P and it should appear at your feet.
And a neat little feature is you can change the way it looks by putting a certain item in the bottom box of its menu when you right-click. It’ll change into various mobs in the game with items like chicken for a chicken, wool for sheep, or cookies for bats! Plus there many other combinations to be had just check the wiki for more information.