Add yourself! Don't put your amount of HP above Brickling's amount of HP. Make sure all your attacks do 0 (at least) to 1000 damage (unless they fire multiple projectiles, in that case make them weaker so they aren't completely op.) If you break the damage limit, you'll either have to wait a while to attack again, or take massive damage next time you get hit. You can add more attacks to Villager, just make sure they're a part of his Smash moveset or they're something from Animal Crossing he can use.
Credit goes to Kyleallt
