Hi! Let's fix this sentence so it sounds right.
Your sentence: Whose loyal friend is Captain Sniff that rescues people?
There are two likely meanings. I will show a correct sentence for each meaning and explain why.
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Meaning A — You want to ask who Captain Sniff is a friend of, and you also want to say Captain Sniff rescues people:
Correct: Whose loyal friend is Captain Sniff, who rescues people?
Why: Use whose to ask about possession (who he is a friend of). Put the extra fact "who rescues people" in commas because it is extra information about Captain Sniff.
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Meaning B — You want to ask who is Captain Sniff's loyal friend, and that friend rescues people:
Correct: Who is Captain Sniff's loyal friend who rescues people?
Why: This asks for the name of the friend. The phrase "who rescues people" describes which friend you mean (the friend that rescues people).
Or, if you only want to say something (not ask a question), you can write:
Captain Sniff is a loyal friend who rescues people.
Pick the corrected sentence that matches what you mean. If you tell me which meaning you wanted, I can help pick the best one.