hooks are by far most useful and fun items in the game, but you do tend to get bored of them after you have mastered every route from rooftop to rooftop in port town, got the best time you can on log challenge and done everything.
It would be cool to have a new weapon which takes just as long to master and get good at, with new abilities, and which opens up possibilites for new challenges.
A boomerang is an example of one of these.
It could be used by anyone, and there could be different variations (standard, quality, magic)
Holding down Left mouse click pulls it further behind your head, and releasing sends it further depending on how long you held down. Moving the mouse to a different position while holding down left mouse click changes the angle of the shot so that you can make the bommerang swift to the side.
Hitting someone with the boomerang from more than 15 feet away stuns them for 1 second (a little like tripping them and making them fall over by surprise, but they can get up by pressing space easily instantly). Other types could knock people over for longer or give a little damage etc.
Any other item ideas?