Della Duck

Della Duck is the daughter of Hortense McDuck and Quackmore Duck and Donald Duck's twin sister, as well as the niece of Scrooge McDuck. She is the mother of Huey, Dewey, and Louie, Donald's triplet nephews. Starting from the second season, she is the one of the pentagonist of of the 2017 DuckTales.

She is voiced by Paget Brewster.

Appearance
Just like how Donald mostly wears a sailor shirt, Della was typically sporting a pilot's outfit. In the past, she had short white hair. In the present, during the ending of the season finale, her grew much longer.

Personality
Despite the fact she is missing in action, she is known as an adventurer. It has been shown that is a high-spirited, daring and courageous woman who loves going on adventure with her family. In many adventures she has been shown to help others, and was a quick thinker that helped to get the family out of trouble. Although it's also she shown to be prankster, as shown in The Secret(s) of Castle McDuck!. However, her thrill-seeking personality often blinds her to the dangers and consequences of her rash selfish actions, which later resulted her becoming lost in space.

Background
Prior to the events of the series, she used to go adventuring with her brother and uncle.

Days before her sons hatched, Della – a passionate pilot and aspiring astronaut – took off with a spaceship built by Scrooge: The Spear of Selene. When she got caught in a cosmic storm, Scrooge tried to guide her through it, but contact with The Spear was lost, and Della hasn't been heard from since. Donald, blaming Scrooge for Della's disappearance, cut off all contact with his uncle and raised the triplets by himself, while Scrooge spent years trying to find his niece, until his board of directors cut the expenses.

Season One
Thus, she only appears on photos and paintings throughout most of the first season, making her first major appearance within the franchise in a series of flashback stories in issue #2 and #3 of the DuckTales comic book.

In the season one finale, she is shown to be alive and well on the Moon, unable to contact Earth; But she does manage to hook up a tv enough to find her family reunited with Scrooge.

Season Two
Years after Scrooge had failed to find his niece, Della made it home using the renovated Spear of Selene.

Trivia

 * It is said that Della is five minutes younger than Donald.
 * It's established that one of her earlier names, "Dumbella", was a derisive nickname used by Donald when he and Della were kids.