Make a class and select what kind of weapon you want your character to wield. Then, make weapons for that character to use. Next, change the class again if you want them to wield different weapons and repeat the weapon making. Then, select the class as your character's battle model. For example, if you want a young boy to fight and wield a sword and shield instead of a dagger, you can use this method to use him as the character to wield swords instead of the daggers, without the 3D model changing during battle to an adult who you do not want fighting.
RPG Maker 3