When it comes to Mario games one of the first things that comes to mind are Koopas, Goombas, Piranha Plants, etc. but which of them do you like most? It can be for whatever reason, whether it be for design or challenge they give you or whatnot. 

For me, it's probably Blooper,

look at how cute it is :3 something about the simple design and use of 2 colors is just really awesome to me XD but its a bitch to get around in the games e.e 

Which enemy is your fave?

Probably Dry Bones

Hammer bros. They really nail this enemy thing.

The axem rangers or smithy from super mario RPG. The axem rangers are fairly comical and it's a great overall parody of the power Rangers. Smithy, while not very prominant until the last stages of the game, was a fantastic boss fight and right down unnerving.

Boos!

They have a silly personality and are pretty hard (impossible without a star) to defeat.

Though I love Shy Guys, they are really more of a Yoshi enemy.

I would say that Red-Shelled Koopas are my favorite bottom-tier enemy, the Hammer Bros duos are great upper-level mooks, and Goombas earn my admiration for their audacity.

Really hard Q! There`s so many good ones, like Shy Guys, Hammer Bros, Dry Bones, Bobombs, Boos, and the hopping black star guys.

Though for my fav, I`m torn between a raven or the bandit. They`re so cute and cool... TwT

Goomba for the win.

Chain Chomp!

I like how they are basically guard dogs,despite being a giant metal ball and chain. They even bark! And they are pretty dangerous as well.

My favorite is Yoshi. It's a difficult enemy that attaches itself to Mario's sprite and can only be defeated by getting hurt and letting it fall into a bottomless pit. My second favorite is  Mario himself because he can't overcome his mushroom addiction and he always loses all of his savings after each level.