The idea was more that his weapon is Pig-as-a-bike (using the 'familiar that turns into a weapon' idea), and that 'giving' him a sword is one of her abilities! He still has to use her (as a bike) to actually use the bulk of his Star Guardian powers, which would be things that more closely correspond to earth-based attacks.

Does that make sense? :|a If it seems needlessly convoluted I can rework the idea so that his main weapon/focus is a sword, but he can tap Pig with it to combine her and the sword and turn her into a vehicle.