Final answer:
Twain establishes Huck Finn as a mischievous rascal through vivid descriptions, the use of the river and nature, and elements of local color humor, dialect, and satire.
Step-by-step explanation:
Twain establishes Huck Finn as a mischievous rascal through various elements in the novel. One way is through vivid descriptions, such as Huck feeling meaner than the meanest man in human history. Additionally, Twain uses the river and nature as a backdrop for Huck's mischievous behavior, showing Huck's desire to escape the dull routines of life. Twain also incorporates local color humor, dialect, and satire, which further highlight Huck's mischievous nature.
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