Super Mario Paintball. 3rd person multiplayer party shooter. Online and offline multiplayer. Mario Kart-like power-ups. Option to use Wiimote and Nunchuk, Classic Controller, Wii U Gamepad, or Wii U Pro Controller. You're welcome.
I knew someone would say something like that. That could work.
I would think a Water Gun, Paintball gun, Flame spitter, Pixelated Arrows that blow up upon impact, lightening gun, etc could all work in the realm of Nintendoland.