The Balloon Lady

The Balloon Lady is a minor protagonist of Mary Poppins Returns. She is the current president of Fidelity Fiduciary Bank and the niece of Mr. Dawes Jr.

While Wilkins acts polite and charming when we first see him, he is actually a ruthless and corrupt corporate executive. This is represented in the Royal Dalton Bowl, where his counterpart is a wolf who pretends to be as docile as a lamb, signifying how he is a metaphorical "wolf in sheep's clothing".

Wilkins drives the main conflict of the film, as he seeks to repossess the Banks family home, to the point of burning important records left by George Banks that would have saved the house.

In the end, tired of how morally bankrupt Wilkins is, Mr. Dawes Jr. reveals that the tuppence Michael deposited in the first film was invested and gathered enough interest to be able to save the Banks family home. In the process, Mr. Dawes Jr. strips Wilkins of his position as president of the bank and asks Hamilton and Frye to escort him away. This, in turn, shows that Mr. Dawes Jr.'s redemption in the first film is permanent.

Trivia

 * Colin Firth, who played Mr. Wilkins, voiced too the Wolf in the animated sequence of the film. This implies that the Wolf is Mr. Wilkins' animated representation (signifying how he is a metaphorical "wolf in sheep's clothing") and thus allows the Banks children to realize that Mr. Wilkins isn't what he seems to be.
 * In spite of being the nephew of Mr. Dawes Jr. and thus the grand nephew of Mr. Dawes Sr., Mr. Wilkins is never mentioned to have the surname "Dawes" on his name.
 * Furthermore, Wilkins' existence reveals that Mr. Dawes Sr. had at least another son or daughter who wasn't seen in the original film, which in turn would be the brother/sister of Mr. Dawes Jr.