Thanks for downloading! Installation may take a while for a few files, but I'll try to explain the most I can to help. I made the installation like this incase you have other custom characters.

Required software:
-szs Explorer
-szs Modifier
-Brawlbox (v0.71 and above recommended)

Important! Make a backup of each file you're going to edit.

| Award Folder |
Contains a single file in brres format, which is Knuckles model in the Award ceremony. To install it, you'll need an Award.szs. With szs Explorer open your Award.szs, search for ys_Award.brres and replace it with the ys_Award.brres file inside this folder. There are two Award.szs files in the game, so be careful which one you'll use.

| Icons |
Contains... Icons, for Knuckles, which can be used for both Character Selection Menu and during a race. To install them, you'll need the following files:
- MenuSingle.szs (Single Player CSS)
- MenuMulti.szs (Multiplayer CSS)
- Race.szs (Ingame HUD)
In SZS modifier open the files and search for Yoshi's icons (they will be in 32x32 and 64x64), when you find them double click on them and replace them with the icons in the folder. I'd recommend you to select the option "Save as" instead of "Save", overwriting the files gave me a few problems.

| Menu |
Contains models that will appear in the Character Selection Screen, like Knuckles and his vehicles. "ys_Driver.brres" is Knuckles' model. To install it you'll need a Driver.szs and Szs Explorer. In szs Explorer open your Driver.szs file and search for "ys_Driver.brres", right click and replace with the brres file included in this folder.
For ys-allkart.szs and ys-allkart_BT.szs just drag and drop them into your SD card, no need to edit them (these files contain the vehicles and Knuckles' animations when riding the vehicles in the CSS).

| Race |
Contains the models that will load during a race, so this is the most important thing in this mod. Installation is easy, but before you drag and drop these files into your SD card, note that there is a folder called | Riders |, this folder contains files that give Knuckles his costume from Sonic Riders (only for bikes). If you want this, copy the files inside the | Riders | folder and paste them inside the Race folder (it will ask if you want to replace the files). If you prefer Knuckles default costume for both karts and bikes, ignore the | Riders | folder, just drag the files inside the Race folder (except for the | Riders | folder) and drop them in your SD card.

| Sound |
Updated (26/03/2020)! Soundbanks have been deleted and instead replaced with wav files. Wav files have been optimized and static effect has been almost removed.

This folder contains Knuckles' voice clips. To install this, you'll need a Revo_Kart.brsar and Brawlbox.
Open your Revo_Kart.brsar with Brawlbox, and a list of different files should display in the right part of Brawlbox (with Index number, file types and names). The folders inside this folder have an index number, search for the files with the same index number in Brawlbox and open them.
A window with two lists should open, the lists are Data and Sounds. Ignore the Data list, just concentrate in the Sounds list. Replace the Audio files with the wav files included in the different folders. If you opened a file with Index number 342, replace the Audio files with the wav files included in the folder with the same Index number.

Anything else needed let me know, I'll do what I can to help. If you spot problems while playing also let me know. Thanks!

Character Ownership - SEGA and Sonic Team