Please note that you can unlock these manually just by defeating area bosses. You can do it even faster by beating area bosses on hard difficulty or higher.

Here's the Bunnys you will unlock:



To do so, you must first go to your %appdata% folder and go to your local files. Here, you'll find a folder named RabbitSteel. You'll click on that, and then go into the folder named SaveFile. The pathing will look something like: C:\Users\YourNameHere\AppData\Local\RabbitSteel\SaveFile

Once inside, you're looking for your unlockdata.ini, and from here you'll open it up and look for the section titled [UnlockOther]

Anywhere in this section, copy and paste the following:

charAncient="1.000000"
charDefender="1.000000"
charBruiser="1.000000"
charSpBlade="1.000000"
charSniper="1.000000"

And if you want the colors, you'll also paste the following in the same area:

paletteLunar9="1.000000"
paletteLunar8="1.000000"
paletteLunar7="1.000000"
paletteLunar6="1.000000"
paletteLunar5="1.000000"
paletteLunar4="1.000000"
paletteLunar3="1.000000"
paletteLunar2="1.000000"
paletteLunar1="1.000000"
paletteLunar0="1.000000"
paletteHard9="1.000000"
paletteHard8="1.000000"
paletteHard7="1.000000"
paletteHard6="1.000000"
paletteHard5="1.000000"
paletteHard4="1.000000"
paletteHard3="1.000000"
paletteHard2="1.000000"
paletteHard1="1.000000"
paletteHard0="1.000000"

Save, and start up the game. You should now have all rabbits and colors unlocked. Enjoy grinding~