Very exciting, I know! I could be wrong, but unless I'm looking at the wrong plant in the plant pot, that's a
Seaweed Planter. Also, what if that's not an NPC, but the player character standing there with someone occasionally pressing left or right? Obviously I hope I'm wrong, of course. I'd love a new NPC.
EDIT: Ah, I see the clay pot in the Painter's room. That plant looks like a random weed on a grassy surface though. They do that when there's nothing planted in them.
EDIT2: Ah, it seems there
is a new plant! It's in the pot in the Merchant's room. My apologies.