The Koopalings

The Koopalings also well known as the Koopa Kids

Are  Bowser 's(A.K.A.King Koopa's) Children are a troop of kids who are always up to Chaos to defeat Mario with their Dad Bowser  and they're first appearance was in the T.V. programme Captain N. and the adventures of Super Mario Bros. 3

Toad

Toad is a Mario game character which comes from a mush
- room species called Toads
Toad first appearance was in Super Mario Bros. 2.
and his newest appearance will be in Super Mario Galaxy  2   before that wait it wasn't Super Smash Bros. Brawl
 so he's in New Super Mario Bros. Wii but in that game
there's two Blue Toad & Yellow Toad and Toad can be played in all the games from Mario-Kart series qnd can be played as in Super Smash Bros. Meele.

Bowser

Bowser is an enemy pass
                                           Stop reading in the name of law

Princess Toadstool

Princess Toadstool's first apeerance was in  Super Mario Bros. and her lastest apeerance 

that is Peach her previous apperance was in Super Smash Bros. Brawl                        

was in New Super Mario Bros. WII 

and thats Peach ;)

Luigi

Luigi is Mario's Younger Bro who mostly is in  Multi-Player games like Mario Kart and Mario Kart 64                                                                                                             

And only in Super Mario Bros. 2 and 3 Luigi can become frog Luigi

and anymore questions about Luigi? huh No

bye bye

Super Mario

Super Mario (A.K.A. Jump Man) may refer to a  main platform video game character from the 1981 arcade game
Donkey*Kong  and Donkey*Kong Jr.
    then after  4 years Shigeru Miyamoto
Donkey Kong
Called Jump-Man Mario
Heres a screenshot of what Mario looked like in his first solo game

Heres what he looks like now

So now you no what the guy up here ^.