I recently watched the first season of RWBY by RoosterTeeth. For a purely internet based show, it's pretty entertaining, and it's got some great weapons concepts and fighting scenes. Basically, most weapons used by the main characters of that show are made by the wielder to match or create their own fighting style. Typically they also transform or otherwise have ways of being used as either a melee or firearm weapon. (For example a Giant Scythe / 50 cal Sniper Rifle) Since these types of weapons are right up my alley I thought I'd take a shot at designing something along those lines.
This here is a Nunchuck Bow. 2 Nunchucks connected by a cord that have extending bits.
Nunchucks: It's melee form is that of 2 nunchucks that can be dual wielded. Instead of a chain, it uses a high-strength cord to connect them. A nice feature of this is that the cord can be extended to several meters in length, and also retracted very quickly. The ends of the Chucks are electromagnetic and can be connected to each other, or other metallic surfaces. The Nunchuck form is typically used for storage and utility in most fights, but occasionally the extending cord is useful for disabling opponents, like using the nunchucks as a whip and tying someone up with the cord, or putting specific arrows on the ends to use them as grappling hooks to aid with mobility.
Staff: The Second Melee form is that of a QuarterStaff, simply connecting the ends of both nunchucks together and extending each grip by 1 stage. If the cords are released just a bit, then the staff can also function as a 3-section staff. Additionally, arrows can be inserted into slots on the ends of the staff, allowing the wielder to make use of their effects at closer ranges, as well as generally giving the staff some pointy bits to impale things with.
Bow: If you connect the ends away from the cord of a single pair of Nunchucks, they extend outwards by the full 2 stages and tighten the cord to form the bow shape. Each Nunchuck is able to do this, however dual-wielding bows is pretty hard last time I checked. However both weapons can be combined to make a larger bow, which can be expanded into an even larger form. The downsides of doing this include added weight, which might make aiming harder, and increased difficulty with drawing back each shot, which can tire out the user faster. However the increased damage and range granted by doing this is usually enough to make it worth it, not to mention that the larger forms aren't used that often.
Quiver: (Not pictured) Stores the arrows for the bow form, but also has some Dust tuned arrows for additional effects, like elemental or explosive damages. And of course some classic trick arrows like the rope arrow for grappling hook type stuff, net arrow for trapping, and plenty others. Proximity explosive arrows would be my favorite probably. Fire them off to set up a long distance trap, or just drop them behind you if time is of the issue.