No. Harry Potter always hated Severus Snape but during the Battle of Hogwarts he witnesses Snape's memories and learns that he was in love with Harry's mother and because of that helped keep Harry alive and helped the Order.
After this, Harry calls his son Albus Severus after the the two bravest men he ever knew proving he at least had some respect for him.
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Severus Snape disliked Harry Potter. He always treated him badly because he was jealous that Harry's father (James Potter) married Harry's mother (Lily Potter). He wished to get married to Lily but James did. So Severus took it out on Harry. BUT, Severus ends up caring for the boy. He grew feelings for him. When he dies he tells Harry, "You have your mother's eyes" then unfortunately perishes. He never hated Harry.
No, Snape could never like Harry because Harry would forever remind Snape that Lily chose James and not him. However he didn't want Harry killed, he tried hard to protect Lily's only child because he knew that was the right thing to do, the thing Lily would want him to do.
Hogwarts exists only in the Harry Potter series.
He left at the end of Harry Potter and the Prisoner of Azkaban.
He is the caretaker.
He spent it at Hogwarts.
There isn't a Harry Potter costume as such, but robes and the Hogwarts jumpers can be purchased in excess of $50 per peice of clothing. There are also house scarfs for $35.