Question: The Golden Christmas Tree is a 20-page funny animal comic book Christmas story written, drawn, and lettered by Carl Barks, the story was first published in Four Color #203 (December 1948), with a cover by Barks, and which 12-page funny animal cartoon character and the official mascot of The Walt Disney Company?

Context paragraphs:
Old California: "Old California" is a 28-page funny animal comic book story written, drawn, and lettered by Carl Barks.  The story stars Donald Duck and his nephews Huey, Dewey, and Louie.  It was first published in" Four Color" #328 (May 1951) with a cover by Carl Buettner, a four-page Grandma Duck story drawn and lettered by Bob Moore, and several one-page gag stories by Moore.

A Christmas for Shacktown: A Christmas for Shacktown is a 32-page funny animal comic book story written, drawn, and lettered by Carl Barks.  The story was first published in Four Color #367 (January 1952), and tells of Donald Duck's attempts to raise money for a Christmas party for the poor children of Shacktown.

The Ghost of the Grotto: "The Ghost of the Grotto" is a 26-page funny animal comic book story written, drawn, and lettered by Carl Barks.  It was first published in Four Color #159 (August 1947) with the 25-page Carl Barks comic book story, "Adventure Down Under".  The cover and both stories have been reprinted many times.

Luck of the North: "Luck of the North" is a 32-page funny animal comic book adventure story written, drawn, and lettered by Carl Barks.  It stars Donald Duck, Huey, Dewey and Louie, and Gladstone Gander.  It was first published by Dell Publishing in Four Color #256 (December 1949) with three gag stories by Barks: "Toasty Toys", "No Place to Hide", and "Tied-Down Tools".  The story, cover, and gags have all been reprinted many times.

Mickey Mouse: Mickey Mouse is a funny animal cartoon character and the official mascot of The Walt Disney Company.  He was created by Walt Disney and Ub Iwerks at the Walt Disney Studios in 1928.  An anthropomorphic mouse who typically wears red shorts, large yellow shoes, and white gloves, Mickey has become one of the world's most recognizable characters.

The Gilded Man (comics): "The Gilded Man" is a 32-page funny animal comic book story written, drawn, and lettered by Carl Barks.  The story was first published by Dell in Four Color #422 (September–October 1952) with a cover by Barks, and three Donald Duck gag stories by Barks: "Stable Prices", "Armored Cat Rescue", and "Crafty Corner".  "The Gilded Man", the cover, and the gag stories have been reprinted many times.

The Old Castle's Secret: "The Old Castle's Secret" is a 32-page funny animal comic book adventure/mystery/horror story written, drawn, and lettered by Carl Barks.  It was first published by Dell Publishing in Four Color #189 (June 1948).  Characters include Uncle Scrooge, Donald Duck, and Huey, Dewey, and Louie.  The story is about a treasure hunt led by Uncle Scrooge through an old castle in Scotland.  It is the first of Uncle Scrooge's comic book treasure hunts.  The story was published with three one-page gag stories by Barks.  The cover is the first comic book cover ever drawn by Barks.  The story has been reprinted many times.

The Golden Christmas Tree: The Golden Christmas Tree is a 20-page funny animal comic book Christmas story written, drawn, and lettered by Carl Barks.  The story was first published in Four Color #203 (December 1948), with a cover by Barks, a 12-page Mickey Mouse and Goofy Christmas story ("Special Delivery") written, drawn, and lettered by Bill Wright, and three one-page Barks Christmas gag stories featuring Donald Duck: "Jumping to Conclusions", "The True Test", and "Ornaments on the Way".  The cover, stories, and gag pages have been reprinted several times.

The Golden Helmet: "The Golden Helmet" is a 32-page funny animal comic book adventure story written, drawn, and lettered by Carl Barks.  The story was first published in Four Color #408 (July 1952) with a cover by Barks and three Barks gag stories starring the Ducks: "Full-Service Windows", "Rigged-Up Lawn Roller", and "Awash in Success".  "The Golden Helmet", the cover, and the gag stories have been reprinted many times.  Donald Duck and his nephews hunt for a Viking helmet that gives the possessor legal claim to North America.

Only a Poor Old Man: "Only A Poor Old Man" is a 32-page funny animal comic book story written, drawn, and lettered by Carl Barks.  It was published by Four Color #386 (March 1952) in the first issue of "Uncle Scrooge".  It was the first comic book story with Scrooge McDuck as its main character (he had already made his debut as a supporting character in "Christmas on Bear Mountain").  The story has been reprinted many times.  It was originally published with the one-page gag stories "Osogood Silver Polish", "Coffee for Two", and "Soupline Eight".  Gemstone Publishing selected "Poor Old Man" for Free Comic Book Day 2005.  Barks expert Michael Barrier has dubbed the story a masterpiece.

Supporting paragraphs: The Golden Christmas Tree Mickey Mouse
Answer: Mickey Mouse