In terms of personality he is endlessly optimistic and selfless, and works on behalf of Smiling Friends to help their clients smile and find happiness. He pretty much never asks a jerk or displays negative qualities, and never tries to give up on a mission to help someone.
The only prevention in terms of personality is in "Enchanted Forest": he becomes increasingly envious of Charlie who steals his spotlight in becoming the Enchanted Forest's hero and adventurer, and for winning over Mip. As a result he becomes a Gollum-like husk of himself and tries to steal Charlie's box (Mip's requested delivery to the princess) over jealousy, which inadvertently gets Mip killed because the struggle accidentally shoves him into a spike. Moral agency isn't an issue because Pim was still angry even before his mental breakdown. He feels remorse and regret immediately after.
However, the issue for NPG seems to fail the admirable standards to Allan Red, who saved the entire city from being blown up by Mr. Landlord's bomb, and to Charlie, who saved tons of lives in the Enchanted Forest and ended century-long wars. That is, unless I'm forgetting something that could make him qualify"
https://hero.fandom.com/wiki/Pim_Pimling