Object number 1: Bulborb (from pikmin) (3d world exclusiv)

They are a variation of the Goomba. When they are small they behave like a normal goomba and are around the same size, just that they only move when they see you. They die from one hit by jump, but can take three fireballs

when they are big they are sleeping, similar to how many normal bulborp in the pikmin games behave, when you are close to them they wake up and they try to eat the player. They need to take five jumps to die, and twenty fireballs, they also slowely regenerate when they go back to sleep

Object number 2: The Ghosts from pacman (Only SMB 1)

The four ghosts from pacman move on the grid like they would in pacman (like clyde moves random etc.) and they are unkilliable the only thing that can kill them is a super star that makes you invisible or when the ghost gets stomped. They can walk through lava/poision.

Object number 3: Luma (from super mario galaxy) (All styles)

Luma is a that will follow you until you die and give a little extra jump like in the galaxy games. That extra hop will be activated by pressing L/R/Bumper, and it will replace any move that is on the Bumper button

Object number 4: Sonic monitor (from sonic) (Only SMBW)

The sonic box is a monitor with a sonic box in it. When you jump onto it the player will turn into sonic with a moveset similar to sonic 3, with jump and spindashes. There can also be a Mario monitor that turns you back

The sonic powerup will not be loss when you get hit, instead you can place rings that will be worth 1 coin when collected as mario, but for sonic they will work like rings do in a sonic game. they will be all lost when hit and save you from death. So when you get hit with 0 rings as sonic you will die, no turning back

Object number 5: Wolly egg (from Yoshi) (Only 3d world)

This will be a power up that turns you into Yoshi with a moveset similar to yoshis island and yoshiscrafted world. So the moveset will be: Eat, Throw and Yoshis better jumps. This will be the Yoshi replacement in 3d world, turning into yoshi

Object number 6: Square key and Square key door (Original idea)
Another shape for keys with another door. Like the Square key works like a normal key just that it works with only Square key doors. Giving some more design possibilities

Object number 7: ON/OFF door (Original idea)
How about a door that only is there when there is a certain ON/OFF state, why not!

And to tie things up: Ideas for the world maker

World idea 1: 2nd win condition

How about a 2nd win condition, that you can do in world maker a 2nd win condition, that when hit will grant another exit, to simply add second ending without editing your level

World idea 2: Overarching Status

That you can take with you what you take in the end of the level, like when you have a mushroom at the end of the level, you will also have it in the next level, and that maybe to ensure that there are no bugs in the system what is taken with is very simple

MUSHROOM: All styles the same (Big mushroom from SMB will turn into this when the next level is not SMB)

Fire Flower: All styles the same

Second Item: Superball flower, Super leaf, Cat bell etc. (The hammer will turn into this when the next level is not 3d world)

Third Item: Super mario bros 2 mushroom, P-balloon, Frog suit etc.

It should be optional of course, since this may will break some worlds

World idea 3: Skip cannon

Cannons that will instantly transport you to a set world (In theory also backwards but that is mean) You can place on per world and they will be combined with 2nd win conditions opening your imagination to adding secrets that will help the player in a big way (unless you do not make them go to world 1 again)

So these were 10 mario maker ideas, I hope you liked them