These are all characters in the Mushroom Kingdom who are good and helpful.
Bob-omb Buddies- These pink Bob-ombs are peace-loving creatures. Unlike their black look-alikes, they're out to stop Bowser from taking over the Mushroom Kingdom. Games: SM64
Bowser?- In Super Mario RPG, the Koopa King, after being forced out
of his castle, joined Mario's team. Games:SMRPG,SMB,SMB3,SMW,SM64,and pretty
much every single game I left out that has to do with Mario
GGaz- The son of the innkeeper of Rose Town.Games:SMRPG
LLuigi- The taller, skinnier, and faster brother of Mario, he usually wears green. Games: MB, SMB, SMB2, SMB3, SMW, YI, SMAS, SSB, MIM, MParty, MParty2, SMBD, SMRPG, MK64, SMK, MT, MG
MMallow - A valuable ally to Mario, he has the ability to control the weather and read enemies' minds and their HP. Games: SMRPG
Mario- Read full article.
Miss Warp- An egg-like creature that is found asleep. If woken up, it will jump up and down, cheering, and you can jump on her to be transported to the next Miss Warp. Games: YS
NNessie- Friendly dark blue sea dragon who offers rides to anyone that butt-stomps on his back. Games: SM64
PPauline- Mario's ex-girlfriend from the 80s, she was captured once by Donkey Kong and was rescued by Mario. Games: DK
Peach (see Princess Toadstool)
Princess Toadstool (or see Peach) - The princess of the Mushroom Kingdom and the apple of Bowser's eye, her life has been an endless series of traumatizing events. She gets captured almost every time, but in SMB2, she participates in the adventure and can even fly! Games: SMB, SMB2, SMB3, SMW, SMAS, SMRPG, SM64, MParty, MParty2, MG, MT, SMBD
TToad- Mushroom retainer who remains loyal to Princess Toadstool. He helps the Mario brothers defeat Bowser in many different ways. Games: SMB, SMB2, SMB3, SMAS, SMBD, SM64, MParty, SMK, MK64, MParty2, MT, MG, SMB2J
WWario- Many sources claim that he is Mario's cousin, childhood friend, his dark-side twin, etc. But whoever he is, he dons a yellow and fuchsia uniform, has a wiry mustache, and is very pudgy, indeed. No, he's not evil, he's just avaricious!
White Shy Guy- A white-robed Shyguy that if freed, will venture out to Baby Bowser's castle and bring back one of the captured Yoshis. Games: YS