honestly all of them have weapons (at least arknights wise) so ill list em and add details if needed :) also ill put ref pics on the twt postlol

starting with Dr.Zheng, while usually they don't appear armed they do have 2 short bo staffs which can combined to make 1 long staff which can be manifested at will (like Nian's greatsword if you will) it was actually forged by Nian hence the manifestation ability!

Raiden fights with a custom built weapon, essentially a fusion of brass knuckles and pathera claws

Cascade just goes with an assortment of knifes

Empyrean has 2 weapons on hand at times, a single daggar with special ingravings and an AR-15 with a scope

Dice also has 2 weapons but this time it's a casting staff with modifications to suit their tastes and a Daisho set

im still figuring out what to give Teumesios but since i play for them to be an Agent Vanguard its probably gonna be either a pair of weapons that can do close and ranged combat or just one that fits both