Do you think 600+ characters are not enought for you? So what about adding even more characters? Add 5 characters to the game.
This mod replaces some live/ultra characters with 5 custom ones:
Just that, enjoy the mod :)
Note: Replace your Power Bomberman data.win in the files with the one from this mod for the characters and the language folder for custom character names. I recommend creating a safe copy of the game before doing this.