Hierophant Green is a whip with a gun in the handle that fires emerald-like bullets. The handle can also be used as a knife (akin to Blake's weapon.) Kakyoin's semblance allows him to mind control people for short amounts of time
Star Platinum is two gun-gauntlets. Jotaro has a semblance that lets him punch incredibly fast and with extreme precision, and a semblance that lets him stop time.
Silver Chariot is a sword with a revolver in the handle. It splits down the side to form two fencing foils (the two halves of the outer sword come together to form the second foil, and the first foil is hidden inside the sword.) Polnareff's semblance allows him to use any metal item as a sword (it sharpens itself upon his touch.)
Magician's Red is a spear that has a cannon inside the head. It's a weighted weapon (akin to Crescent Rose) and Avdol has a semblance that allows him to control fire.