But I don't want to add 40+ characters, I just want to add a few.

Hello, I am new to these forums and brawl hacking in general. I have a modded Wii, but not much knowledge about hacking a Wii. I am interested in adding a few characters to my character select screen, and I'm not sure where to start. I know I want to add slots for them, instead of replacing other characters, so I believe I've come to the right place. Is there a way I can just download characters from the vault and add them into new character slots? I'm very confused about how to do this.