I'd say Mario is lawful good. Of course, we have no grasp on the laws of the mushroom kingdom. He seems almost obliviously good, like there's no real malice there, he's just doing things.

Kirby is the same way, i think. He can't do evil, but it's not like he's really striving for anything.

Lawful Good does not mean follows the law.

This is one of the dumbest misconceptions in the entire alignment rulesets.

Pheonix wright?

I hope not. Lawful Good characters are such a bore ...

The entire cast of Animal Crossing

*cough*D&D Nerd*cough* Though I think it scarier that I know that the alignment references you use i've been familiar with for about 20 years :\

Anyways yes a majority of Nintendo iconic characters are either Neutral or Chaotic Good. Lawful by original D&D does indeed mean someone who follows the rules, though the origin of the rules can be flexible; spiritual, personal, religious and so on. Though over time the reference to lawful has been less strict.

PS. D&D alignment valuation suck. They are relatively archaic, strict and don't define enough of the myriad of possibilities. I know they have been shoe horning extra meaning, but it still aweful.

By the 3.5 incarnation, Lawful refers to someone who is methodical and organized.  You may as well replace the word "Lawful" with the word "Consistent."

for illustration purposes

http://img25.imageshack.us/i/batmanalignment.jpg/

What about the protagonist of Disaster, Day of Crisis. Though he is probably more Chaotic Good.

My first inclination though was to say "It's me. Mario."

Mike from Morgantown

See the bolded part.

And Alterego-X,you jerkass. You know TV Tropes Will Ruin Your Life.