Maybe he needs to be Kobold-ified, to make him less size-ist/species-ist? 😝

that's a neat idea hehe

Submitted one anonymously, but it appears comments are preferred. Here's some potion ideas that could be used on the shopkeep.
Potion of Vargouillism: Temporarily detach head from body, ears become wings, as a Vargouille. Intended use is scouting/exploration.
Stone-Flesh Oil: Converts stone to flesh or flesh to stone. Useful to save a petrified ally, stone an enemy, or weaken a golem.
Serpent-Speaker: A potent elixir that allows the user to communicate with reptiles of all kinds for a day by ingesting a single drop. However, misuse or overuse can cause reptilian transformations, and the loss of being able to speak to anything but reptiles.
Sleeping Draught: Places a creature into a near-comatose state for 8 hours. Used to guarantee a good night's sleep.
Underwater Breathing Potion: Switches the user from breathing air to breathing water through magically-formed gills. Clear warning to be in or very near water when consumed, as user can suffocate on air after imbibing this.
Meekform Potion: Transforms user into a very small animal (mouse, lizard, etc). Remains for an hour, or until user is injured or killed after which they are "poofed" into their original shape in the nearest available open space. Intended use is sneaking/spying.

I check both so it doesn't really matter :P

Those are some fun ones!