Mario + Rabbids: Kingdom Battle has Amiibo Support. You can unlock a weapon for Luigi, Peach, Mario and Yoshi (and there Rabbit Counterparts). Any Luigi, Peach, Mario and Yoshi Amiibo figurine is compatible to unlock them.
To use the Amiibos you need to defeat the first mini-boss in World 1, then you can use the amiibo R&D Rabbolatory (use the tube right from Peach’s Palace)