A few random quirky items for your game

1. Portal Gun: Like the game. It can be a wand instead for fantasy.

2. Phasing Spear: It can stab through doors and other barriers as if they weren't there.

3. Healing Arrows: Dipped in healing potions, they deal damage first, but if the target survives, they heal one die-size larger. Deals bonus damage instead to undead.

4. Silence Earplugs: Make you immune to non-physical magics, but also deaf.

5. Mood Ring: You can psychically sense the mood and motivations of those around you, but your own are projected from the ring itself.

6. Magic 8 Ball: Divination and/or quantum collapsing item that actually uses a d20 despite the name. Can only be overruled by the Magic ∞ Ball.