sedex

1:  Npc: Dark beast
     Item: Full Slayer helmet-15492
     Amount: 1

There may already be these available although i haven't seen anyone in-game have one so im not sure if you can get them but if not please do.

2:  Npc: Giant mole
     Item: Staff of Light-614
     Amount: 1
 
Could you make it a rare drop and have its stats really high so it would be a rather expensive item to posses if you get it and maybe instead of giant mole have it as a drop in the saradomin bosses chamber.

3:  Npc: Any monster suited to you (or have a poll for the players choices)
     Item: Zamorakian Spear-474
     Amount: 1