I think the Dynasty and Samurai Warriors series have some good examples...
Samurai Warriors
*Motochika's shamisen (Japanese banjo) that shoots purple orbs of doom!
*Oichi's ball and cup...yes, a ball and cup.
*Magoichi's perfectly accurate, rapid firing, fire ball shooting...musket.
*Kojiro's nodachi and broadsword that he pulls out from another dimension.
*Okuni's umbrella.
*Kotaro's stretching guantlets...yeah kinda hard to explian this one.
*Ieyasu's cannon spear, it's basically a hand held cannon that has a lid with a spear on it that opens and closes. It's also semi-automatic

*Hanbei's bladed compass.
*Ujiyasu's cane that has both a hidden blade and hidden gun in it.
Dynasty Warriors
*Zhen Ji's flute, with the ability to create orbs of doom by playing melodies (she can also slpa people to death).
*Zhuge Liang and Sima Yi's feather fan that shoot beams (of doom) and tickle people to death.
*Sima Yi's claws that can shoot wires from them that stab enemies and can be used to manipulate people like puppets.
*Yue Ying's arm-mounted, rapid firing, bladed crossbow.
*Ma dai's paintbrush...yes a paintbrush.
*Cai Wenji's erhu (Chinese violin) and harp which act similarily to Motochika's shamisen).
*Meng Huos stone column, coconut tree and giant mushroom combination. He uses the column to smash people then he can pull a tree from the ground and spin it causing the cocunts to shoot out and then he can also pull a giant mushroom from the ground, take a bite, and spit the poison at people. Then he just chucks that away and pulls the column back out from the ground.