How could you improve a Mario game?

Shoko

Dry Bowser
Wiki Bureaucrat
'Shroom Consultant
MarioWiki
Shokora
What could you suggest to improve a Mario game and why?
 
Add Baby Luigi

problem solved
 
Just debug the SMB stories.

But honestly we don't really see Nintendo try to deal with some significant problems.

Uniju said:
Add Waluigi to Mario Kart 7.
? roster is a problem, but Waluigi isn't the only one with the problem.
 
Yup. That's the only problem. I guess they could remove Koopa Cape too while they're at it but that's not a big deal.
 
Uniju said:
Add Waluigi to Mario Kart 7.

How could they leave him out
 
Personally, what I really despise about many Mario games is when there is little rewards for completing a game. Like, in the GBA game Mario & Luigi: Superstar Saga, after the credits roll and the player returns to the title screen, replaying the file will just bring the player back to the end of the final boss castle, where I last saved. I was expecting some kind of bonus stuff but nope. It's like you never even fought the boss, as I still had all the items I used during the battle. It was the same deal with Bowser's Inside Story and Paper Mario: Sticker Star.

I could probably suggest a few similar things for the VB game Virtual Boy Wario Land, which is a great game for the most part. There is a total of ten treasures to collect within ten levels. It's those kinds of games where there is a map for how far you've progressed, but you can't really select levels to replay. The only way you could replay levels to to just walk back the way you came. After beating the game, I couldn't go back and collect the treasures I missed :-\ If you replay the file, you just wind back to the last boss, and it's a pain to make your way back. So one you beat the game, the file you're playing on becomes completely useless.
 
Cirdec said:
Add Peach and Daisy in New Super Mario Bros U.
Actually I would add Wario and Waluigi, with each character having different abilities.