Who is Mr. Blucher from The Innocents Abroad and what is their importance?

Mr. Blucher is a fill-in character who represents just about any passenger on the excursion. Bulcher makes an appearance any time indignation is required to tell the story. Mr. Blucher is a person of strict focus, and therefore, great misunderstanding when things do not follow his internal script. He is often seen in the book protesting some form of injustice having educated himself in the matter ahead of time. He is also revealed later in the book to be a bit of a magpie. He collects relics and labels them with tags of higher importance than they are. And when questioned about it, Mr. Blucher replies that his aunt, for whom the relics are for, will never know the difference.