As my niece was letdown that she were unable to customize the appearance of the main character (whose name I still don't know, somehow), I edited the savefile to access all the options without getting all the stars. I also believe that some options were unavailable due to a bug, but they might just have other unlock requirements.

To possibly help other people with this, I'm making this short guide as there appeared to not be one on Steam.

First of all, we have to find the file.

On Windows it's located at C:\Users\Username\AppData\LocalLow\Melbot Studios\MLP.
The easiest way to navigate here is by pressing the windowkey and writing/pasting:
%userprofile%\appdata\locallow\melbot studios\mlp\

In this folder you'll find three things.
1. A folder with a series of digits.
2. A file with a matching series of digits.
3. A file named steam_autosave.vdf



What we're after is the file with a series of digits.

For those curious, this series of digits matches the steamID3 of your Steam account. So your file's digits will not match mine.

The first thing to do is to backup the file. Do this by making a copy at a location of your choice.

To unlock objects, open the file with a text editor of your choice. If you're unsure, use Wordpad.

In the file we'll find a long line of text. What we're after is the text that follows after "unlockableItems", these are the items that are in the game and can be unlocked.
The structure is:
Item\:false/true
Where "Item" can, for example, be PegasiNecklaseV1 followed by true or false depending on if you've unlocked it or not.

What you want to do now is to go through all the items between UnlockableItems and the text "on\". "on\" isn't an item, but a boolean representing the running state of the game, so if the game is currently being played or not.

Example:

to


The entirety of my UnlockableItems text looks like this:



And if you want to copy-paste it, here's the text:

,\"unlockableItems\":{\"SunnyPurseV1\":true,\"BeanieV1\":true,\"FakeHornV1\":true,\"ChokerV1\":true,\"SoldierHelmetV1\":true,\"WindmillHornV1\":true,\"GrannyGlassesV2\":true,\"GrannyGlassesV1\":true,\"PartyGlassesV1\":true,\"Scarf01V1\":true,\"Scarf02V1\":true,\"PegasiNecklaceV1\":true,\"FashionMarkV1\":true,\"FakeWingsV1\":true,\"FakeWingsV2\":true,\"ShirtCollarV1\":true,\"Glasses01V1\":true,\"Glasses01V2\":true,\"Glasses02V1\":true,\"Glasses02V2\":true,\"PartyGlassesV2\":true,\"Scarf02V2\":true,\"Scarf01V2\":true,\"BeanieV2\":true,\"SunnyPurseV2\":true,\"CutieMarkV1\":true,\"AlicornWingsV1\":true,\"AlicornHornV1\":true,\"FlowerNecklaceV1\":true,\"IzzyHatV1\":true,\"FloatV1\":true,\"PearlEarringsV1\":true},