Top Ten Purest Characters in the Super Mario Series
This is a list of the characters who are the most pure, have good intentions, and display a healthy range of emotion. The characters' prominence and influence on the series will affect their placement. Only the character in their default version is accepted; alternate forms of characters will not be considered.
Out of every single character in the entire series, Luigi displays the widest range of emotions and the most selfless behaviors. He's so kindhearted, he's always helping others, even occasionally his enemies! He's always quick to recover from abuse and he's always showing compassion and love towards his friends and family. He respects others' boundaries and always strives to do the right thing. I don't think Nintendo, or any company could ever make a character that deserves to be loved for their personality more than Luigi.
Luigi may not be fearless or confident like his brother Mario, but his emotional growth shows his purity and desire to improve his weaknesses. Coupled with his strengths and his love for all others, Luigi may very well be the purest character the series has ever seen.

No matter how many times Mario has abused Yoshi in some way, Yoshi still helps him with his adventures. Yoshi has done nothing wrong! In fact, if not for Yoshi, Bowser would have destroyed both the Mario Bros. and their entire world. Yoshi is always positive and cares for Mario and Luigi.

Toadette has been a valuable asset to Mario and Luigi on their many adventures, always thinking of new ways to help them achieve their goals.

Rosalina acts as a mother figure to the Lumas. She's a very kind and caring woman. She takes it upon herself to oversee the safety of the galaxy.

Lumas guide Mario through the cosmos and help him get where he needs to go. The little star children are so friendly to Mario and Luigi.

She was the only person in the entire world who believed Count Bleck could still have good, even when Bleck himself denied he could. Her mission to save Bleck from the Dark Prognosticus was out of pure love and hope. Thanks to her and Mario's party, Bleck was able to redeem himself, and they sacrificed themselves to destroy the Chaos Heart, saving the world from destruction.

Geno takes it upon himself to repair the Star Road after Smithy and Exor shatter it when invading the Mushroom Kingdom. Since the Star Road is responsible for granting people's wishes, Geno has tasked himself with an incredible burden. Not to mention, he's never done wrong and always manages to keep a level head.

A young puff who adventures with Mario to help destroy Smithy and find his place in the world. His desire to do the right thing while also learning several moral lessons and confiding in his allies while still being so young earns him his placement on this list.

Toadsworth may not be Peach's most competent subject, but he does show concern for Princess Peach, and is willing to trust Mario. He does more to defend the safety of the princess than every other Toad in the Mushroom Kingdom.

She's a competent and caring mayor. Enough said.