I would be a merchant that claims to be an alchemist, and sells you items that "change how people perceive you." Those types of items are...

Gifts/Romance items: I sell you stuff to romance other characters in the game, be they NPC, or other players. Oddly, I am the only character in the game that you can't romance. This is upsetting to most players as I'm the hottest. Except when i'm laughing at your attempts to romance me and always manage to say something that makes you feel small and vulnerable. I may be in cahoots with the end game boss, but nobody knows for sure.

Transformation potions: When you want to look like someone or something else. Typically the effects wear off in combat, so it's just for fun.

Generic buff potions: While in the lore, your enemies only perceive you to be stronger/faster/tougher, they do work as far as the game is concerned.

Event items: In a free to play MMORPG, during Valentines day, Halloween, or any holiday that involves dressing up or impressing others, I will likely be the event NPC.

When attempting to chat with me, I often say things that start sounding like flirting but end sounding like insults.

"Well you're pretty...ugly."

"You remind me of a childhood friend. I won't make that mistake again!"

"Please tell me you're single, people like you should definitely stay single."

Also, because I'm constantly downing potions as experiments, my appearance changes every time you enter the aria. Sometimes I'm a Man, Sometimes a Woman, but the one constant is that i'm always holding a large vial and throwing masked insults at you.