I don't think octopuses (octopi?) use umbrellas either. But I do remember in one of the older games, that if you caught an octopus and one of your octopus neighbors was nearby they would get really mad.
I could have swore Marina was carrying an umbrella in the rain the other morning. I'll pay closer attention the next time it rains.
I could be wrong, but I'm pretty sure I remember Octavian not carrying one, at least in City folk.
The little piranha in the fish museum...bounces off the tank walls.
Unique footprints in the snow for each villager. Also works with shoes.
Well Zucker uses an umbrella so...I don't think octopuses (octopi?) use umbrellas either.
Dream Addresses can last a LONG TIME.