up air attack could be him using the newspaper that the beaver on the toilet holds and the down air attack could be grunkfuss the clown using his lany arm to hit his enemy

Maybe his specials could be more focused on his friends helping, such as the Owl lifting Flumpty as a recovery, or a down special involving Grunkfuss grabbing the opponent.

For a little context to the down special, it could be a stunlock where Grunkfuss grabs the opponent, and flings them in multiple directions, or just bites them for extra damage.

Aerials could be reworked slightly.

Upward Aerial - Pulls out the Eyesaur and swings him around while holding his tail.
Forward Aerial - The Redman Pop-Up, but also making the move stun the opponent.
Backward Aerial - Grunkfuss appears and does a punch downward, spiking the opponent.
Downward Aerial - Summons the Furnace Flumpty clone to fly downwards.
Neutral Aerial - Flumpty spins around with his arms and legs sticking out and hits the opponent.

Also just some slight nitpicks.
- In the thumbnail and victory image, Flumpty has no eyebrows.
- His dash attack face could alternate between the many faces he has made.
- Side and Down Special could use a slight rework.

Overall though, I adore this character! Can't wait for any updates that may come.