The Harry Potter riddles

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Across
  1. 2. I roam the woods of Hogwarts school, and my coat is a lovely white. But don't you dare try to drink my blood, or you'll be cursed for life. Who am I?
  2. 5. Beware you must, for change I will. What am I?
Down
  1. 1. First think of the person who lives in disguise, who deals in secrets and tells naught but lies. Next, tell me what's always the last thing to mend, the middle of the middle and the end of the end? And finally, give me the sound often heard during the search for a hard-to-find word. Now string them together and answer me this, which creature would you be unwilling to kiss? Who am I?
  2. 3. What does Harry Potter have that Voldemort doesn't?
  3. 4. He's the star of the book series, who saw King's Cross when he was dead. He is a famous Gryffindor and there's a lightning scar on his head. Who is he?